$\left(y-3\sqrt{5}\right)\left(y+3\sqrt{5}\right)$
$\lim_{x\to-2}\left(\frac{x+2}{\sqrt{8+x^2}-4}\right)$
$\frac{dx}{dy}=\left(x+1\right)^2$
$30x^4+36x^2+6$
$\frac{-11\cdot\:\:0.42611}{2\pi}$
$\frac{d}{dy}e^{xy}+y=x-1$
$-3x-8=2x+27$
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