$\frac{d}{dx}\frac{d}{dx}\left(-xe^{-x}+e^{-x}\right)$
$-\left(11+\frac{1}{y}\right)\left(11-\frac{1}{y}\right)$
$2xy+yz^2-xz;\:x=2;\:y=5z=2$
$\frac{1-\cos^2\left(x\right)}{1-\sin^2\left(x\right)}=2\tan^2\left(x\right)$
$\left(\frac{x^3}{\sqrt{x^2+25}-5}\right)$
$\left(2a+9b\left(2a-7b\right)\right)$
$2,\:32+3,\:48+4,\:01+5,\:79+6,\:00$
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