$\lim_{x\to-\infty}\left(\frac{e^{-x}}{\sqrt{x}}\right)$

$\int\left(\frac{2x}{\sqrt{x^2}+3}\right)dx$

$\frac{\left(\frac{2}{7}x^2\right)}{\left(x^4\right)}$

$\lim_{x\to4}\left(\frac{\sqrt[6]{5-x}-1}{x+4}\right)$

$\frac{3x-2}{4}=2x-8$

$\frac{1-\cos^2x}{\sec^2x-1}$

$\left(m+11\right)\left(m-1\right)$