$\left(x^3\:-\:9\right)\left(x^3\:+\:1\right)$
$\left(-3\right)^2-4\left(5\right)\left(6\right)$
$\ln\left(x-2\right)-\ln\left(2\right)=\ln\left(3x+1\right)+\ln\left(20\right)$
$\frac{5}{x-3}-\frac{2}{x}=1$
$\int\cos^4\left(\frac{x}{3}\right)dx$
$\frac{dy}{dx}=6\:-\frac{2y}{300+x}$
$2y^2+4y+4$
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