$tan\:\frac{a}{3}=-1$
$\frac{d^2}{dx^2}\left(x-y^2\right)$
$\lim_{b\to-2}\:3b-4$
$\int6\ln\left(x^2\right)dx$
$\frac{5x^3-2x-8}{x+1}$
$y\frac{dy}{dx}=\left(y+1\right)^2$
$\frac{2x+2}{4x^2+2x}\cdot\frac{x}{x+3}$
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