$\left(\frac{2}{3}x+\frac{1}{2}y\right)^5$
$15\cdot30$
$\int\frac{1-4x}{x^2-9}dx$
$\left(3u^2\right)\left(5u^{-8}\right)$
$2sin\left(x\right)x^{-3}$
$\tan\left(180-x\right)\cos\left(-x\right)$
$\sqrt{x^2-81}\cdot\:\sqrt{x^2+81}$
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