$\frac{x^22x+2}{x+2}$
$4\cos\left(x\right)^2-5\cos\left(x\right)+4$
$4-x=12$
$x^5\cdot y^{-2}$
$\int\frac{x^3}{\sqrt{4x^2-81}}dx$
$2log\left(x-1\right)-log2=log\left(x+3\right)$
$\left(4+\frac{9}{n}\right)\left(4+\frac{9}{n}\right)$
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