$\lim_{x\to-4}\left(\frac{x^2+3x-4}{x+4}\right)$

$\frac{x^9}{x^5}$

$2x+1\:\cdot\:3-x$

$\sec^2\left(x\right)\cdot\cot^2\left(x\right)-1$

$x^2-\frac{3}{4}x+\frac{12}{4}$

$\sqrt[5]{a^8x\:b^{11}x\:c^{10}}$

$+\left(+8\right)-\left(-2\right)+\left(-5\right)-\left(-6\right)+\left(-9\right)-\left(+5\right)$