$\int\frac{x^2+1}{x^3}dx$
$4x^2+6x=12$
$\frac{\left(2x+4y-7\right)\cdot\left(6x-5+9y\right)\left(-12y+5x+3\right)}{2x+6x}$
$\int ze^{-2x}dz$
$x\frac{-16}{4}$
$2x\sin x^2$
$\lim_{x\to-2}\left(\frac{sin\left(x+2\right)}{2\left(x^2-2x-12\right)}\right)$
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