$4x+3y=18$
$\frac{cot\left(-x\right)+tang\left(-x\right)}{cot\left(x\right)}$
$15a^2-2a-1$
$\int\frac{x^2-4x-4}{\left(x-2\right)\left(x^2+4\right)}dx$
$\int\left(x\ln\left(5-x\right)\right)dx$
$\frac{dy}{dx}=\frac{2y}{y+x^2y}$
$\int\frac{7x^2+3x-1}{x^3-2x^2+x-2}dx$
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