$20<-19+u$
$\:\int\:\:x^2\:e^{-ax}dx$
$\csc\left(y\right)+\sec^2\left(x\right)\frac{dx}{dy}=0$
$4x^2-12x+2$
$4x^2-24x=28$
$\int sin\left(2x\right)sin^2\left(x\right)dx$
$\lim_{x\to\pi}\left(\frac{cos\left(7\pi\right)}{x-\pi}\right)$
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