Problem 3 70 .pdf

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Original filename: Problem 3-70.pdf
Title: Microsoft Word - 3.2.3 3-70
Author: alderman12

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3-70. DERIVATIVES OF SINE AND COSINE GRAPHICALLY
It appears that the derivatives of sine and cosine are related. What about the second
derivatives?
You will be given a resource page with five sets of axes, vertically aligned. The x-axis is scaled


from [−2ߨ, 2ߨ] by ଶ , and the y-axis is scaled from [−2, 2] by 1.
a. Sketch as accurately as you can ݂ሺ‫ݔ‬ሻ = sin ‫ ݔ‬on the top set of axes. Draw bold dots on
all maximum and minimum points.
b. On the second set of axes, sketch ݂ ′ሺ‫ݔ‬ሻ (found in 3-69) as accurately as you can.
c. Compare the graph of ݂ሺ‫ݔ‬ሻ with ݂ ′ሺ‫ݔ‬ሻ. What does ݂ሺ‫ݔ‬ሻ look like when ݂ ′ሺ‫ݔ‬ሻ = 0?
Your teacher will show you how to use Desmos to find the slopes of tangent lines along
the curve. These slopes of ݂ሺ‫ݔ‬ሻ can be plotted to result in the same ݂ ′ሺ‫ݔ‬ሻ graph that
you created on your resource page. For this demonstration, visit:
http://tinyurl.com/FXsine

d. Repeat the Desmos process for ݂″ሺ‫ݔ‬ሻ, ݂′″ሺ‫ݔ‬ሻ, and ݂ ௜௩ ሺ‫ݔ‬ሻ, the second, third and fourth
derivatives of ݂ሺ‫ݔ‬ሻ.
To create ݂″ሺ‫ݔ‬ሻ, visit: http://tinyurl.com/FXtrig2
To create ݂′″ሺ‫ݔ‬ሻ, visit: http://tinyurl.com/FXtrig3
To create ݂ ௜௩ ሺ‫ݔ‬ሻ, visit: http://tinyurl.com/FXtrig4
e. What do you notice about ݂ ௜௩ ሺ‫ݔ‬ሻ ?
f. Predict ݂ ଶ଴ ሺ‫ݔ‬ሻ and ݂ ଵ଴ଵ ሺ‫ݔ‬ሻ.

݂ሺ‫ݔ‬ሻ

݂′ሺ‫ݔ‬ሻ

݂′′ሺ‫ ݔ‬ሻ

݂′′′ሺ‫ ݔ‬ሻ

݂ ௜௩ ሺ‫ݔ‬ሻ


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