$cot\:x\left(tan\:x+cot\:x\right)=csc^2x$
$\left(3x+3\right)\left(3x-3\right)$
$\frac{x}{x+1}\:+\frac{2x}{x+1}$
$\int\frac{x^5-1}{x+1}dx$
$\frac{dy}{dx}=\sin\left(x-ax-b\right)$
$x^2\le9$
$\frac{dy}{dx}-2\:=\sin\left(x\right)$
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