$\lim_{x\to3}\left(\frac{3-x}{\sqrt{x+1}-\sqrt{5x-11}}\right)$

$\left(n^2+12\right)\left(n^2-12\right)$

$\int\frac{y^3}{\left(a^2-y^2\right)^{\frac{3}{2}}}dy$

$\frac{dy}{dx}=y^2e^{-x}$

$\sqrt[3]{-2}+2\sqrt{-8}-\sqrt{-32}-\sqrt{-18}$

$\lim_{x\to0}\left(\frac{e^{-x^2}-1}{x^2}\right)$

$72\:-\:\left(-48\right)\:-\:180\:-\:\left(-18\right)$