integral of cos^2(theta)

[mcwang719]

Hello i was working on a triple integral problem and went all the way to the last integral and got $\displaystyle \int {\cos ^2 \theta d\theta }$ how would you integrate that? thanks!!!

 

[pka]

Go to this site.
http://integrals.wolfram.com/index.jsp

 

[galactus]

Try integrating the identity \(\displaystyle \L\\\frac{1}{2}(1+cos(2x))\)

 

[Unco]

cos^2(x) = that, G-man means.