$\frac{d}{dx}\frac{x^2-1}{x^2+1}$
$\int\left(e^x\right)\sqrt{64-e^{2x}}dx$
$54a^3b-81a^2b^2-108ab^3$
$-1200xy+900y^2+400x^2$
$\int5x^3\:dx$
$498+71$
$\left(8-4+7-2\right)+\left(-13+5-7\right)-\left(-4-3+8\right)$
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