$\frac{d^2}{dx^2}\left(\frac{2}{x}\right)$
$\left(x+y-z\right)^3$
$\int\left(3-2x+x^4\right)dx$
$\left(2m-6n^2\right)^2$
$\frac{2cosx-2cos^3x}{sinx}=sin2x$
$\sqrt{9\tan^2\left(x\right)+16}$
$3^2\cdot5^{-2}\cdot5$
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