$x^3y^3-2x^2y^4-4xy^5$
$\frac{15}{3}+4$
$60^2\:-\:50^2$
$6x\le-18$
$x^2+15x+54$
$\frac{\sin\left(3u\right)\cos\left(u\right)-\sin\left(u\right)\cos\left(3u\right)}{\sin\left(u\right)\cos\left(u\right)}$
$\int_4^{\infty}\left(-\frac{1}{x^2+3}\right)dx$
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