Unit Plan
Calculus
12th grade
Mrs. Abbett
Unit 5 – The Integral
22 days Jan. 26 – Mar. 1
Students start this chapter by using Riemann sums to approximate the area of a region bounded by a continuous function. They are able to see the inaccuracy of this method by doing the same problem with half of the students using left hand endpoints and half of the students using right hand endpoints. We then look at integration first as an antiderivative and then as a method to determine area more accurately. We look at different ways to rewrite functions so that they will be more easily integrated.
The first application of an antiderivative that we investigate is vertical motion. Using gravity as the acceleration of an object moving vertically and labeling acceleration as f’’(x), we can use integration to determine velocity and height. Then we start finding the area of objects with known area formulas by integration. We move on to functions with graphs that are unknown curves and find the area between the graph and the x axis by using definite integrals.
Once the students have learned the basic ways of integrating a function, other methods are explored. We discover how to integrate by change of variables and substitution. We also find area by using the Trapezoidal Rule and Simpson’s Rule.
1. Antiderivatives and Indefinite Integration.
2. Vertical Motion Problems.
3. Reimann Sums and Area.
4. Definite Integrals.
5. The Fundamental Theorem of Calculus.
6. Integration by Substitution and Change of Variables.
7. The Trapezoidal Rule and Simpson’s Rule.
College Board AP Calculus Standards and Goals:
Interpretations and properties of definite integrals
- Definite integral as a limit of Riemann sums
- Definite integral of the rate of change of a quantity over an interval interpreted
as the change of the quantity over the interval.
- Basic properties of definite integrals (examples include additivity and linearity).
- Use of the Fundamental Theorem to evaluate definite integrals
- Use of the Fundamental Theorem to represent a particular antiderivative, and
the analytical and graphical analysis of functions so defined.
- Numerical approximations to definite integrals. Use of Riemann sums (using
left, right, and midpoint evaluation points) and trapezoidal sums to approximate
definite integrals of functions represented algebraically, graphically, and by tables
of values.
Daily Plans
Day 1 – Definition of an Antiderivative
Introduce the antiderivative as the inverse of the derivative. Give each student a function to find the derivative of, with the only difference in the functions being the constant term. Share the results with each other, and brainstorm why each student got the same answer. Demonstrate how to find an antiderivative. Discuss the effects of taking the antiderivative on the graph of the function, and how there is an infinite number of constants that can complete the function. Do examples on the smart board and using the graphing calculators.
Assign: Page 248, #6 – 30 even.
Day 2 – Integrals of Trig Functions
Recall the derivatives of each of the six basic trig functions. Practice simplifying expressions using different trig identities in pairs. Define the integral of sine and cosine, and have the students determine the others. Use these integrals and simplification techniques to find the integral of various trig functions.
Assign: Pages248-249, #31-42.
Day 3 – Solving Differential Equations
Show how to set up dy/dx = f(x) as y = F(x) + C. Put in the given point to find the value of C. Check answers using the graphing calculators. Do examples as a whole group.
Assign: Page 249, #46-60 even.
Day 4 – Sigma Notation
Recall sigma notation and finding the sum of a function. Have each of the students make a problem using the correct notation. Rotate the problems so that each student will solve someone else’s problem. Have students discuss their results with each other. Now, give an expanded version of a sum and ask the students if they can determine the correct sigma notation, in essence, work backwards. Do other examples on the smart board.
Assign: Pages 260-261, #2 – 22 even
Day 5 – Limits of Sums
Introduce Lower and Upper Sums of a given region. Show the difference in the sums when using the right or left endpoints of the subintervals. Extend the concept to the Limit at each the lower and upper sums. Do examples as a whole group.
Assign: Page 261, #24 – 38 even
Day 6 – Area of a Region
Do investigation to find the area between the x axis and a given parabola. Have one student estimate it by dividing it into 4 regions, one student six regions, and the other student eight regions. Compare the results of each student. Use the results to find the area of a general region: any isosceles triangle, rectangle, semi-circle, etc.
Assign: Page 262, #42 – 50 even
Day 7 – Definite Integrals
Introduce and explain the symbols used to represent a definite integral. Show graphically what it represents. Recall the parabola from yesterday and do the problem together using a definite integral. Compare the answer with yesterday’s result. Do examples on smart board and check the solutions on the graphing calculators.
Assign: Page 271 – 272, # 2 – 24 even
Day 8 – Evaluating Definite Integrals
Extend yesterday’s lesson to include trig functions, rational functions and radical functions. Practice as a whole group setting up a definite integral to represent the area under a given curve. Discuss how to set up a pair of definite integrals when part of the graph is below the x axis.
Assign: Page 283, 6 – 30, 34 – 42 even.
Day 9 – Second Fundamental Theorem Of Calculus
Define the Second Fundamental Theorem of Calculus. Show how it relates to the definite integrals that we have been using the last two days. Discuss the appropriate times to use the Theorem and demonstrate on the smart board how it is used.
Assign: Page 285, #50, 52, 74 – 84 even
Day 10 – AP Practice Problems
Day 11 – Unit 5 Mid – Chapter Review
Day 12 – Unit 5 Mid – Chapter Test
Day 13 – Integration by Substitution
Recall f(g(x)) and g(f(x)). Take a function that is composed of two simpler functions and discuss ways to break it apart into f(x) and g(x). Find f(g(x)) and g(f(x)) to determine if the students solution is correct. Substitute their solutions into the integral to make it easier to integrate. Do examples on smart board.
Assign: Page 296, #2 – 26 even
Day 14 – Finding the Equation by Integration
Recall yesterday’s lesson. Extend it by looking for an exact function when given a point. Discuss how to use substitution when finding a definite integral and how to tell when substitution is not the best option. Have each student look at a problem and determine the method they would use to integrate it. Discuss their solutions and see if the others agree with their choice.
Assign: Page 296, #34 – 54 even
Day 15 – Area by Substitution
This is the last extension of substitution. Students should look at a given graph, set up the definite integral, determine the method of integration to use, and evaluate the integral to get the area. Include examples that involve radicals and trig functions. Show students how to enter an integral into the graphing calculators. Use the calculators for one example and then do an example by hand. Check the solutions on the graphing calculators.
Assign: Page 297, #56 – 68 even
Day 16 – Trapezoidal Rule
Discuss ways that we know so far to estimate the area under the curve. Introduce the Trapezoidal Rule and have students discuss how it may be more accurate than dividing an interval into rectangular subintervals. Practice using the Trapezoidal Rule to find an integral as a whole class.
Assign: Page 304, #2 – 10 even
Day 17 – Simpson’s Rule
Introduce Simpson’s Rule for estimating an integral. Have students find the ways that Simpson’s Rule and the Trapezoidal Rule are similar and how they are different. Have each student evaluate an integral using each method and present their findings to the rest of the class.
Assign: Page 304, #12 – 20 even
Day 19 – Error formulas and Applications
Discuss area problems that might not be able to be solved by using a definite integral: irregular shapes, impossible to reach boundaries, etc. Show how the Trapezoidal Rule and Simpson’s Rule can be applied to these problems. Then Analyze the error involved in the estimation.
Assign: Pages 304 – 305, #22, 24, 38, 40, 42
Day 20 – AP practice problems
Day 21 – Unit 5 Review
Day 22 Unit 5 Test