$\:20\:.\:2\:.\:22\:.\:23\:$
$\lim_{x\to0}\left(\frac{9sin^2x}{1-\sec\left(x\right)}\right)$
$\left(x+5\right)\left(x-5\right)\left(x^3-2\right)$
$2x-xy-3xy$
$3\left(2\right)^4+7$
$\int\frac{7}{\left(1+x\right)}dx$
$20-40+18$
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