$\left(2x+y\right)^2-\left(x-2y\right)^2$
$2\tan^2x-\sec^2x$
$\frac{\left(-12x^8y^{10}\right)}{\left(-4x^2y^3\right)}$
$\frac{625-x\:^4}{5+x}$
$\int\frac{1}{x^2\sqrt{9-25x^2}}dx$
$\int\frac{1}{5x^2-9}dx$
$\int_0^{\pi}\left(\sin\left(x\right)e^{-x}\right)dx$
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