Originally Posted by

**dagbayani481** I have three in particular, two of which I can't seem to get anywhere and another which I think I may have domain issues.

-Just for reference, I can only solve these using u-substitution or through anti-derivatives that we've memorized. (i.e. sinx'=cosx, x^n'=n-1x^n-1, etc.)

1.)$\displaystyle \int^\frac{\pi}{4}_\frac{-\pi}{4} \frac{t^4tan(t)}{2+cos(t)}\,dx$

I've tried u-substitution for this one but when finding du/dx nothing seems to replace every t variable to simplify into something that's easy to integrate. I've tried rewriting but rewriting it makes it even more complicated. (I've tried rewriting tan(t) into sin(t)/cos(t), I've tried to split up the problem, but no avail, nothing seems to work) A few tips on how to start would greatly help!!