$\left(2y\right)dx+x^2ydy=0$
$\int e^{\frac{-2r}{a}}dr$
$\lim_{x\to-3}\left(2x^4-5x^3+7x\right)$
$-2+\left(-3\right)-\left(+5\right)+2-8$
$\frac{2}{\:\left(x\left(x+2\right)\left(x^2-1\right)\right)}$
$10b-80ab^2$
$- ( 7 n - 24 ) ^ { 2 }$
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