$\lim_{x\to-2}\left(\frac{x^2-9}{x^2-3}\right)$

$\left(\left(x\cdot e^y\right)+\left(e^y\right)\right)\cdot y'=x-1$

$\left(-6\right)-\left(-1\right)$

$a+16=25$

$\left(\frac{1}{4}b^{-1}x^2-2ay^{\frac{2}{3}}\right)^3$

$\frac{\sqrt{x^2+x}+\sqrt{6}}{x^2-3x+2}$

$\left(x^2\:-\:7\right)^2$