$\int r\:\ln\left(2r\right)\:dr$
$2\cos\left(x\right)\sin\left(x\right)=2$
$x^2-4x\ge12$
$4\cos\left(a+7\right)=9$
$3n^5-30n^3+75$
$\frac{\tan^2\left(x\right)-2tanx-3}{\tan\left(x\right)+1}$
$\frac{2}{5}x+4\le-12$
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