- #1

PieOperator

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## Homework Statement

From angles pi minus theta1 to pi plus theta1, what is the integral of cosine of 2 theta times d theta?

## Homework Equations

## The Attempt at a Solution

When I evaluate this definite integral from pi minus theta1 to pi plus theta1, I get positive one half sine of 2 theta1.

It should be NEGATIVE one half sine of 2 theta1.

Is 2pi + 2theta1 and 2pi - 2theta1 somehow wrong?