Needing to evaluate the integral:

sin(2x)/(47+(cos(x))^2)dx

This question might belong somewhere else but.. It's been a while since I've taken trig and is (cos(x))^2 the same as cos^2(x) or 2cos(x) or something entirely different?

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- Jun 3rd 2010, 10:46 AMabel2Minor help with integrals
Needing to evaluate the integral:

sin(2x)/(47+(cos(x))^2)dx

This question might belong somewhere else but.. It's been a while since I've taken trig and is (cos(x))^2 the same as cos^2(x) or 2cos(x) or something entirely different? - Jun 3rd 2010, 10:52 AMGeneral
**Rewrite $\displaystyle sin(2x)$ as $\displaystyle 2sin(x)cos(x)$**

**then substitute $\displaystyle u=cos^2(x)$ ..** - Jun 3rd 2010, 11:01 AMabel2
ahh, thanks. I'm not good with trig identities.