$\frac{b^2}{ab}$
$\left(15+2x\right)\left(15-2x\right)$
$\lim_{x\to-\infty}\left(\frac{x^2}{\sqrt{x^2+1}}\right)$
$\left(3y^7-7x\right)\cdot\left(9y^{14}+21y^7x+49x^2\right)$
$\:2x^2\left(4y-3x\right)$
$\int_0^{30}\left(\left(-440+15\cdot x-0.15\cdot x^2\right)\cdot\left(-20\right)\right)dx$
$y'=2y^2$
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