# the trigonometric identity

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Could you show me how to plot the graph and find the area of the region for

r = 2cos(theta) for -pi/2 <= (theta) <= pi/2

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##### Solution Summary

The trigonometric identity is utilized.

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The solution is attached below in two files. the files are identical in content, only differ in format. The first is in MS Word format, while the other is in Adobe pdf format. Therefore you can choose the format that is most suitable to you.

The polar equation is:

(1.1)

Then:

(1.2)

Using ...

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