$\int\frac{x-4}{x^2-9x-20}dx$
$\frac{dy}{dx}+\frac{y}{x}=y^3$
$\cos\left(\frac{5\pi}{2}-\theta\:\right)=sin\:\theta\:$
$\frac{dx}{dy}=\left(1+2x\right)\sqrt{y}$
$12-\left(7\cdot3-15\right)\cdot4$
$\left(3xy\right)\:+\:\left(\:12xy\right)\:+\:\left(-18xy\right)$
$-519+\left(-9782\right)$
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