$\int\frac{3x+9}{\left(x+1\right)\left(x+2\right)}dx$
$\sin\left(x\right)\cdot\left(\cot\left(x\right)+\sec\left(x\right)\right)+\csc\left(x\right)$
$\cot^2\left(x\right)+4\cot\left(x\right)+3=0$
$-\frac{210}{14}$
$\frac{3xy^{3}}{9x^{2}y}$
$\frac{x^8}{x^{-2}}$
$x^2-4x+4\le0$
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