$x^2+5yz-z^2;\:x=2;\:y=-1;\:z=1$
$\int\frac{1}{3\cos\left(x\right)+\sin\left(x\right)+1}dx$
$-x\le8+2x$
$a^2-a^2b^2+\frac{b^4}{4}$
$\lim_{x\to1}\left(\frac{ln\:x}{x-1}\right)$
$x^2-12-36$
$4b^{-\frac{1}{4}}$
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