$-140\left(-13\right)\left(4\right)$
$16-\left(7^2\right)$
$\frac{secx}{tanx-sinx}=\frac{1+cosx}{sin^3x}$
$\int\left(-xe^{-3x^2}\right)dx$
$\left(3x+10\right)\left(x-2\right)$
$\log x+\log\left(x-21\right)=2$
$\lim_{x\to1}\left(\frac{e^{xa}-e^a}{x-1}\right)$
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