$\frac{2\cos\left(2x\right)}{1+\cos\left(2x\right)}=2-\sec^2\left(x\right)$
$3cot^2z+7cotz+2$
$f\left(x\right)=tanx^2sec\:x$
$\:\int\:1+\frac{-2}{x-1}dx$
$x+5\le-2$
$\int\:\frac{2x^3-x^2+2}{x^2-x}dx$
$\left(5z-4\right)^3$
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