$2x^2+18x+36$
$sinx\left(cotx+tanx\right)$
$-16\cos\left(2x\right)\sin\left(2x\right)=0$
$\sec\left(x\right)^2+\csc\left(x\right)^2=\sin^2\left(x\right).\sec^2\left(x\right)$
$\frac{4x}{x-2}+\frac{2x-3}{x-2}$
$\int x^2udx$
$\left(6m-3n\right)\left(6m+3n\right)$
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