$\frac{x^{-1}y^{-2}}{x^{-2}y^2}$
$\lim_{x\to0}\left(\frac{1}{2}\left(-x^2+1\right)^{-\frac{1}{2}}.-2x\right)$
$2-8x^2$
$-6a^2,\:6ab,\:2b^2,\:-a^2$
$5y'-2e^{3x}y=0,\:y\left(0\right)=4$
$\left(-30\right)-311-\left(-418\right)$
$y=\frac{2e^{6x^2+2}}{3}$
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