$\left(csc\:a+1\right)\left(csc\:a-1\right)$
$-\frac{1}{2}\left(10x-4\right)-\left(4x-2\right)$
$-4\left(-8\right)\left(-2\right)$
$16.277-5.118$
$\frac{d^3y}{dx^3}=2x$
$\frac{x^2-3x-3}{x+2}$
$\frac{dy}{dx}=\frac{x^2}{3y}$
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