$\frac{x^2-1}{x+1}25$

$x^3\cdot\:\:y'\:=\:x^4\cdot\:\:y^2\:-\:2\cdot\:\:x^2\cdot\:\:y\:-\:1$

$\lim_{x\to-9}\left(\frac{-8x^2-71x+9}{x+9}\right)$

$\frac{-24x^4y}{-8x^5y}$

$\left(x+2\right)\left(x+6\right)-\left(x+4\right)^{2}+x>2$

$\lim_{x\to12}\left(\frac{144-x^2}{12x-x^2}\right)$

$\left(-5vw^2\right)^3$