$6n^4\:-\:12n^2\:+\:6$
$\frac{d^2}{dx^2}\frac{y}{x^2+y^2}$
$\int\frac{2}{9x^2+1}dx$
$\frac{dy}{dx}=\frac{2xy}{y+1}$
$\sqrt{x^2y}$
$\left(sen2xsenx\:+\:cos4xcosx\right)sec2x$
$\int\:te^{6t}dt$
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