$8x^{-3}\cdot y.3 x^2 y^{-4}$
$\sin\left(b\right)\left(\csc\left(b\right)-\sec\left(b\right)\right)=1-\tan\left(b\right)$
$\int\frac{5}{e^x\sqrt{5+e^{2x}}}dx$
$\lim_{x\to a}\left(\frac{x^n-a^n}{x-n}\right)$
$\left(2x+4\right)\left(5x+7\right)$
$\frac{x-3}{x+4}=\frac{-2x-1}{x+4}+3$
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