$\cos\left(a\right)=\frac{-12}{13}$
$\left(5x^2y^2-1\right)^2$
$\left(c-5\right)^3$
$9.\left(1-x\right)+2x=-5$
$\frac{d^2}{dx^2}\left(x^9\right)$
$\sqrt[3]{1}\sqrt[9]{1}$
$4x\:2\:\cdot\:5x$
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