$\frac{\csc-1}{\csc^2}$
$65+70$
$\left(x+2\right)\left(x-\frac{1}{2}\right)$
$\frac{2\cdot\sqrt{3}-\sqrt{2}}{\sqrt{18}}$
$\frac{d}{dx}\left(\sqrt{x^2+3x}\right)$
$\cos\left(x\right)=-.1$
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