$5\cos\left(x\right)\cos\left(5x\right)$
$1-4a^2$
$6n^2-23n+20=0$
$24x^2+24x+6$
$\frac{dy}{dx}\left(x^3+3xy^2+y^3=5\right)$
$\int_{-2}^{-1}\:\frac{\sqrt{x^2-1}}{x}dx$
$\left(3k+2y\right)\left(3x-2y\right)$
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