$2\tan-\sec^2$
$\lim_{x\to1}\left(30\right)$
$\left(9a^{m+1}-4b^{10}\right)^2$
$1.4\cdot10^1$
$\left(x-22\right)\left(x+15\right)$
$\frac{d}{dx}5\cdot\ln5$
$3x^{2\:}+\frac{6x}{\left(5+x\right)}$
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