$\left(\:x\:-\:7\right)\:\left(x\:+\:15\right)\:$
$\left(y-2\right)\left(y-5\right)$
$4\tan\left(2y\right)=-1$
$-4+6+-14+7+-42+4$
$\frac{dx}{dy}=\frac{x}{y}$
$\frac{d}{dx}e^y+14-e^1=3x^2+2y^2$
$m^2+3m-3=0$
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