$\cot^2\:\left(x\right)\cdot\left[1+\tan^2\left(x\right)\right]=\csc^2\left(x\right)$
$3cos^2x$
$\int\frac{60}{t^3+4t^2-5t}dt$
$2z^2-9z-5$
$4x^2+1x+49$
$\frac{d^2}{dx^2}\left(x^2inx\right)$
$\frac{x^{14}+128}{x^2+2}$
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