$\left(x+5\right)\:\left(x-7\right)\:$
$2csc\left(x\right)cos^2\left(\frac{x}{2}\right)$
$\frac{dy}{dx}=\left(y-4x+2\right)^2$
$\left(2f\right)\left(-3f\right)$
$-6+15xy-9y$
$x'=x-t^2$
$144y^2-9\left(x^2-36\right)$
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