# Integral u-substitution Problem [duplicate]

Possible Duplicate:
Evaluating $\int P(\sin x, \cos x) \text{d}x$

I'm given, $$\int \sin^2(x) \,dx$$

I'm struggling finding the appropriate value for u to integrate using u-substitution.

Any suggestions?

Thanks

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## marked as duplicate by Jonas Meyer, Aryabhata, Akhil MathewApr 7 '11 at 23:37

$\sin^2 x = \frac{1 - \cos(2x)}{2}$. Now you can integrate it.
I'd try thinking about your trig identities and whether you know anything that would make $sin^2(x)$ simpler before jumping to u-sub.