$\frac{d}{dx}-5x^{-1}$
$\frac{dy}{dx}=\left(2-x^2\right)y^2$
$\int\left(\frac{\sqrt{2x^2-4}}{x}\right)dx$
$\sqrt{m-n}+\sqrt{m-n}$
$\cos\left(2x\right)\cos\left(\frac{x}{2}\right)-\cos\left(3x\right)\cos\left(\frac{9x}{2}\right)$
$sin\left(x\right)^2+\sin\left(x\right)^2\cot\left(x\right)^2$
$\:12v\:+\:12\:-\:8v\:+\:\left(-4\right)$
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