$2x+9x^2$
$\int\frac{3}{2\cos^25x}dx$
$\left(2mn-1\right)^3$
$3\left(n+2\right)=9\left(6-n\right)$
$\frac{db}{dt}=\left(10-t\right)\left(t-30\right)$
$\frac{2y}{y^2+1}\frac{dy}{dx}=\frac{1}{x^2}$
$\frac{x^2}{2x+-1}=\frac{-x}{3}$
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