$\frac{d}{dx}\left(\:y^3-2xy^2=x^3y+5x^2y^2-1\right)$
$\frac{1+2\sin\left(x\right)}{\sin\left(x\right)}-\sin\left(x\right)$
$a^2b^4-225$
$\frac{\left(t+1\right)}{t}=\frac{1}{t}$
$-15ab\:+12ab\:-\:9ab\:+4ab$
$\int_{-3}^3\:\frac{18}{\left(x^2-6x-72\right)}dx$
$x^3-4x=0$
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