$\frac{\left(\left(n+1\right)x^n\right)}{2^n+n}$
$\frac{2x}{\sqrt{x-2}-\sqrt{x}}$
$\sin x+\sin x\cdot\sec\left(x\right)^2$
$x\:=\:-2,\:y=\:2$
$4sin^2x-3$
$\frac{d}{dx}\frac{1}{x^4}$
$\lim_{x\to0}\left(\frac{e^{x^2}-1}{x\cdot0-x}\right)$
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