$\int\frac{1}{4}\left(\frac{cos\left(x\right)}{sin^2\left(x\right)}\right)dx$
$0=-0$
$x^2+5x-9$
$3n+10;\:n=-3$
$\left(\frac{x^{-3}}{3x^{-6}}\right)^{-3}$
$50.279+8.489\ln\:\left(18\right)$
$30\cdot\left(-2\right)$
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