$\tan\left(x\right)+\cot\left(x\right)=\sec\left(x\right)-\cos\left(x\right)$
$\frac{d}{dx}\left(\sqrt{3+\tan\left(xy\right)}-2\right)$
$\left(-19+2\right)\left(0-3\right)$
$\left(-15\right)\left(-15\right)$
$\frac{2x-6}{\sqrt{x-2}-1}$
$\int\left(\frac{x^3-x^2-x+3}{x^2-3x+2}\right)dx$
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