**Integral Sin 2 Theta**. In this tutorial we shall derive the integral of sine squared x. There are no examples in the book; am I missing some kind of trig identity or something?

It is very important that as this is not a definite integral, we must add the constant C at the end of the integration. Part of a series of articles about. There are no examples in the book; am I missing some kind of trig identity or something?

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Rearrange to make cos theta the subject.

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