$2\cdot\frac{0}{\frac{3}{\infty}}$
$-5xy+3yz-7xz;\:x=-1;\:y=3;\:z=-2$
$y^2+2^2$
$u^2-3u-6$
$3\cot^2\left(x\right)+\csc\left(x\right)=1$
$\left(-2+t\right)^2$
$\left(z^3+4z-3\right)\left(2z^3-7z+1\right)$
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