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Transcript of Calculus AB APSI 2015 Day 2 Professional Development Workshop Handbook Curriculum Framework Calculus...
![Page 1: Calculus AB APSI 2015 Day 2 Professional Development Workshop Handbook Curriculum Framework Calculus AB and BC Professional Development Integration, Problem.](https://reader036.fdocument.pub/reader036/viewer/2022062716/56649e105503460f94afae9f/html5/thumbnails/1.jpg)
Calculus AB APSI 2015
Day 2
Professional Development
Workshop Handbook
Curriculum Framework
Calculus AB and BC
Professional Development
Integration, Problem Solving, and Multiple
RepresentationsCurriculum Module
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Tuesday► Morning (Part 1)
► Developing Understanding of the Derivative
► Upload TI 84 Programs
► Big Idea 1: Limits
► Break
► Morning (Part 2)
► Ideas That Can Be Explored Before Working with Formulas
► Connecting Graphs of f, f’, and f”
► Connecting Differentiability with Continuity
► Introduction to Local Linearity
► How f’(a) fails to Exist
► How Can One Graph Help Describe Another Graph?
► Lunch
► Afternoon (Part 1)
► Share an Activity
► Discussion of Homework Problems
► Break
► Afternoon (Part 2)
► Slope Fields
► Reasoning with Tabular Data
► Big Idea 2: - Derivatives
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►Multiple Choice Questions on the 2014 test: 9, 11, 15, 19, 21, 22, 23, 27, 28, 82, 88, 89, 90, 91, 92
►Free Response:
►2014: AB3, AB6
►2015: AB2, AB3/BC3
Tuesday Assignment - AB
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► Students should explore understanding the forward difference quotient, the backwards difference quotient, and the symmetric difference quotient
Numerical Approach
( ) ( )f a h f ah
( ) ( )f a f a hh
( ) ( )2
f a h f a hh
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( ) ( )f a h f ah
Forward Difference Quotient
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( ) ( )f a f a hh
Backward Difference Quotient
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( ) ( )2
f a h f a hh
Symmetric Difference Quotient
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0
( ) ( )limh
f a h f ah
0
( ) ( )limh
f a f a hh
0
( ) ( )lim
2h
f a h f a hh
All lead to the derivative of a function at a point x=a.
Activities with the graphing calculator can numerically and graphically develop understanding for the algebraic approach.
Definition of a Derivative at x=a
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Understanding The Derivative Numerically Using Difference Quotients
Activity
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Understanding The Derivative Graphically Using Difference Quotients
Activity
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The values of a derivative are not random. They are values of a function defined by
As we saw in the first two activities this limit defines a function of x, not a number.
0
( ) ( )'( ) lim
h
f x h f xf x
h
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Example
2
0
2 2
0
2 2 2
0
2
0
0
0
( )
( ) ( )'( ) lim
( ) ( )lim
2lim
2lim
2lim
lim
2
2
h
h
h
h
h
h
f x x
f x h f xf x
hx h x
hx xh h x
h
x
xh hh
x h
h
h
h
x
Do you see how this relates to the activity we did on the difference quotients?
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Building upon these activities it is
now appropriate to explore the
analytical approach to the definition
of a derivative
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0
0
0
0
0
0
0
( ) sin
( ) ( )'( ) lim
sin( ) sin( )lim
sin cos h sin hcos sinlim
sin (cosh 1) sin hcoslim
sin (cos h 1) sin hcoslim
cos h 1 sin hlim sin cos
cos h 1sin lim co
h
h
h
h
h
h
h
f x x
f x h f xf x
hx h x
hx x x
hx x
hx x
h h
x xh h
xh
0
sin hs lim
cos
hx
hx
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►You may want to go on and learn other properties of the derivative and uses of the derivative before you actually derive the formulas for the derivatives.
►Once you get into the formulas that’s where the emphasis will be and not on the concept.
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2y1 = 2 xy1(x+0.001)-y1(x)
y2 = 0.001
When y1 is increasing, what do you notice about the values of y2?
When y1 is decreasing, what do you notice about the values of y2?
When y1 reaches a maximum, what do you notice about the value of y2?
Making Observations about the Function and Its Derivative
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2y1 = 2 x y1(x+0.001)-y1(x)y2 =
0.001
Making Observations about the Function and Its Derivative
When y2 is equal to zero, what do you notice about the behavior of y1?
Would you describe y1 as concave down or concave up? How would you describe the slope of y2?
Activity
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Upload TI 84 Programs
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Big Idea 1 - Limits
Page 358-359
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Big Idea 1 - Limits
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Ideas That Can Be Explored Without the Knowing Derivative Formulas
• Using any of the difference quotients (with small h
values) obtain graphical (and sometimes numerical)
information that can be generalized.
x
y
x
y
x
y
The graph of f The graph of f ’using the difference
quotient with f
The graph of f “using the difference
quotient with f ‘
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Notice that •when the derivative of f is positive the original
function f is increasing and tangent lines to f have positive slopes
•when the derivative of f is negative the original function f is decreasing and tangent lines to f have negative slopes
•when the derivative of f is zero after being positive and then negative the original function f has reached a minimum;
•when the derivative of f is zero after being negative and then positive the original function f has reached a maximum. ;
•The slope of a tangent line to f at a maximum or minimum is zero.
x
y
x
y
x
y
x
y
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• If the derivative of f is positive and decreasing the slope of the original function f must be decreasing (or f is concave down)
• If the derivative of f is negative and increasing the slope of the original function f must be increasing or (or f is concave up)
• A minimum of f occurs when the derivative of f goes from negative to positive; A maximum of f occurs when the derivative of f goes from positive to negative
x
y
x
y
x
y
x
y
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• When the sign changes on the second derivative of f the concavity of f is changing sign and a point of inflection of f has been located
• Differentiability of f implies Continuity of f but continuity of f does not imply differentiability of f.
x
y
x
y
x
y
x
y
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Extreme Value Theorem
A function f, continuous on a closed interval, must have both an absolute minimum and maximum valueThe location for an extrema is found where the function changes from increasing to decreasing or visa versaWe also need to check the value at either endpoint
x
y
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A derivative of a derivative is the second derivativeThe 2nd derivative provides the same information about the first derivative that the first derivative provides about the functionWhen the second derivative of a function is positive-the first derivative of the function is increasing –the slope is getting steeper
x
y
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► A function f is concave up if
► f’ is increasing
► f” is positive or
► A tangent line to f lies below the graph(except at the point of tangency)
Concavity
x
y
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► A function f is concave down if
► f’ is decreasing
► f” is negative or
► A tangent line of f lies above the graph(except at the point of tangency)
► Concavity is defined on an interval not at a point
Concavity
x
y
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► A point where the second derivative of a function (f”) changes sign (therefore changing the concavity of function f) is called a point of inflection
A Point of Inflection
x
y
• First find where the second derivative (f”) is zero or undefined. Check on both sides of that point to see if the second derivative (f”) changes sign
• Points of inflection correspond to the extreme values of the first derivative (f’) equal zero.
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► Functions are not differentiable at the endpoints of a closed interval.
► The limit only exists from one side
Remember
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Connecting Graphs of f, f’ and descriptions
Match graphs of f, f ‘ and descriptions of f and f’
Section 3 of Notebook
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Connecting Continuity and Differentiability
Because a limit is used to define the derivativeIf the derivative exists at a point, the function is continuous at that point
Differentiability implies continuityIf a function is differentiable at a point, it is continuous thereIf a function is differentiable on an interval, it is continuous on the interval
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Is a continuous function differentiable?Is a differentiable function continuous?
𝑦 1=𝑥2−2
𝑦 1=¿ 𝑥∨−2𝑦 2=¿¿
Activity
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► Local linearity is a property of differentiable functions that says – roughly – that if you zoom in on a point on the graph of the function (with equal scaling horizontally and vertically), the graph will eventually look like a straight line with a slope equal to the derivative of the function at that point.
► Local linearity is the graphical approach to the derivative
Local Linearity
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► Functions that are differentiable are locally linear, and, conversely, functions that are locally linear are differentiable.
► Unfortunately, there is no sure way of determining whether a function is locally linear until you know if it’s differentiable.
► Locally linear is a good, informal, way to introduce the concept of the derivative and to let your students see what differentiable means.
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► Local linearity and the secant line approximations can be explored in precalculus without reference to differentiability.
► Local linearity can be introduced through zooming out and zooming in
► Differentiable functions are smoothFunctions that are not differentiable have sharp bends or discontinuities in them
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Introduction to Local Linearity
J.T. Sutcliff
Write a rule for each of the three lines. Give justification for why youwrote each equation.
1 2y x 3 2y 5
23
y x
y1
y1
y3
y5
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►Which line is
1 sin2y x
33 .002y x
5
2.001
3y x
y1
y3
y5
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► Enter each of these functions in your graphing calculator in a zoom 4 Decimal window. Record your sketch below
1 sin2y x
33 .002y x
5
2.001
3y x
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Zoom in on the origin by resetting the window to [-0.004, 0.004, 0.001, -0.003, 0.003, 0.001].
What has happened to each of the graphs when you look at a very small window around the origin?
1 sin2y x
33 .002y x
5
2.001
3y x
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► We say that a function is locally linear when we can make a curved line appear linear.
► Rewrite the equation of each graph at the right now that you know the scale.
y2
y4
y6
6
20.001
3y x
4 0.002y
2 2y x
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► Each straight line equation that you wrote is called a linear approximation for these graphs at the point x = 0.
6
20.001
3y x
4 0.002y
2 2y x
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► Enter these equations in your graphing and view all six equations in a zoom 4 decimal window.
► Compare the six graphs in the zoom in window.
6
20.001
3y x
4 0.002y 2 2y x
x
y
x
y
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► Each linear approximation (or equation) is also called a tangent line to the corresponding graph.
► Build a table near x = 0and notice how you can approximate y1(.01) by looking at y2(.01).
► Also look at y3(.01) and y4(.01) and y5(.01) and y6(.01)
x
y
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Graph the equation in on a zoom 4 decimal window.
Zoom in to a small window and write the equation of the line that can be used as the linear approximation for this function atx = 0.
tan2x
y
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How f’(a) Fails to Exist
Activity
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► Thinking about the Derivative of a Function
Sample Differentiation Lessons
• The Rules for Differentiation
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► Multiple Choice Questions on the 2014 test: 9, 11, 15, 19, 21, 22, 23, 27, 28, 82, 88, 89, 90, 91, 92
► Free Response:
► 2014: AB1, AB2
► 2015: AB1/BC1, AB6
Monday - AB
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2014 AB1
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Scoring Rubric for 2014 AB1
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Calculus in MotionAnimation of 2014 AB1
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2014 AB2
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Scoring Rubric for 2014 AB2
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2015 AB1
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Scoring Rubric 2015 AB1
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2015 AB6
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2015 AB6 Scoring Rubric
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► There are two different types of problems in an AP Calculus course.
► In one type, you are given a function and then asked about its rate of change;
► in the other type, you are given how the function changes and then asked to identify the function.
► Thus derivative and antiderivative permeate the course.
Slope Fields
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►The term differential equation may seem formidable at first, but since a differential equation is nothing more than an equation that involves a derivative, differential equations occur throughout the course. A solution to a differential equation is simply a function that satisfies the equation.
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► Most people think that if they are handed a differential equation the task will be to solve it.
► But what is a differential equation really describing?
► Students can be asked to describe the behavior or tangent lines based on the differential equation.
► Introducing Slope Fields (Smartboard)
Introducing the a Slope Field
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Create a Slope field
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Creating Basic Slope Fields
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• Reading Slope Fields
• Using Technology to Create Slope Fields
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Nancy Stephenson’s Materials on AP Central
• Slope Field Card Match• Slope Field Handout
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Build activities so that student
► become familiar with the terminology of differential equations
► recognize what is meant by a solution to a differential equation
► use differential equations in modeling applications
► understand the relationship between a slope field and a solution curve for the differential equation
What to include in your study
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► verify whether or not a given function is a solution to a differential equation
► manually construct a portion of a slope field for a given differential equation
► choose from among many differential equations which one is associated with a given slope field
What might students be asked to do
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► Choose from among many slope fields which one is associated with a given differential equation
► Recognize exponential growth and decay, the governing differential
►
equation and its solution
► Solve a given separable differential equation
dyky
dt
kty Ae
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► Solve a given separable differential equation
► is a solution to a differential equation if and only if
( )y f x
' ( )dy
f xdx
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Slope Field Matching Cards
Section 4 of Notebook
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2008 Curriculum Module
Reasoning with Tabular Data
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Approximate y’(12) and explain the meaning of y’(12) in terms of the
population of the town.
Instantaneous Rate of Change
Pages 1 and 2
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Approximate, with a trapezoidal rule, the average population of the town over the
20 years.
Average Value of a Function
Pages 1 and 2
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Use a midpoint Riemann sum with three subintervals to approximate
Explain the meaning of this definite integral in terms of the water flow, using correct units.
12
0( )R t dt
Approximate an Integral
Pages 3 and 4
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Use P(t) to find the average rate of water flow during the 12-hour period. Indicate units of measure.
Evaluate an Average RatePages 4 and 5
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Approximate the distance traveled over
Using a right Riemann sum with four intervals.
Approximate a Total Distance Traveled
Pages 5 and 6
0 10 secondst
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Use P(t) to find the average rate of water flow during the 12-hour time period. Indicate units of measure.
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Other AP Free Response questions that reference tabular data
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► Using derivatives to describe the rate of change of one variable with respect to another variable allows students to understand change in a variety of contexts.
► In AP Calculus, students build the derivative using the concept of limits and use the derivative primarily to compute the instantaneous rate of change of a function.
► Applications of the derivative include finding the slope of a tangent line to a graph at a point, analyzing the graph of a function (for example, determining whether a function is increasing or decreasing and finding concavity and extreme values), and solving problems involving rectilinear motion.
Big Idea 2: Derivatives Page 360-363
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► Students should be able to use different definitions of the derivative, estimate derivatives from tables and graphs, and apply various derivative rules and properties.
► In addition, students should be able to solve separable differential equations, understand and be able to apply the Mean Value Theorem, and be familiar with a variety of real-world applications, including related rates, optimization, and growth and decay models.
Big Idea 2: Derivatives
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► Multiple Choice Questions on the 2014 test: 9, 11, 15, 19, 21, 22, 23, 27, 28, 82, 88, 89, 90, 91, 92
► Free Response:
► 2014: AB3, AB6
► 2015: AB2, AB3/BC3
Tuesday Assignment - AB