$4x^2-8x+15\:$
$\sqrt{x^3}+2$
$\int\frac{1}{x^2\left(x^2-4\right)}dx$
$\int4x^3\sin xdx$
$\cot^2x=\csc^2x$
$\left(\sin\left(x+y\right)\cos\left(x-y\right)\right)$
$\int13xsec^2\left(x\right)dx$
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