$\frac{1-4\tan^2\left(x\right)}{1-2\tan\left(x\right)}=1+2\tan\left(x\right)$
$tan^2x\:-\:sec^2x\:+\:2$
$\int\left(\frac{e^2}{e^x-1}\right)dx$
$-3+10-8-45+15$
$20x^4\:-\:32x^3$
$\frac{dy}{dx}=x-\frac{1}{x}\cdot y$
$\frac{d}{dx}2\cos8x$
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