$\int\left(cot^2xcosx\right)dx$
$s^4+8s^2+16$
$a^2+21a-20$
$\frac{1}{\sqrt{1-4y^2}}\frac{dy}{dx}-e^x=0$
$x^7\cdot x^{12}$
$4\:-\:20:\left(-5\right)$
$\left(x^2-1\right)\left(x^2-11x+28\right)$
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