$\left(x+1\right)\left(x-2\right)\left(5x-2\right)\left(x+3\right)$
$-81x+450x^4-625$
$\lim_{x\to0}\left(\frac{\left(x\right)}{x^2-1}\right)$
$\sec^2a-\tan^2a=1$
$-17+1+80+9$
$-3\left(x+1\right)\le2x+15$
$\int\frac{1}{\sqrt{100+4x^2}}dx$
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