$\cos\left(a+1\right)\left(\sec\left(a\right)-\tan\left(a\right)\right)$

$\frac{1}{x-5}+\frac{1}{x+5}$

$\left(x-2\right)\left(x+3\right)+\left(x+5\right)\left(x+2\right)-2x^2-16-10x$

$5m^2+8^2$

$\int\frac{x^5}{\sqrt{x^2+4}}dx$

$z^4+z^2+z^3$

$\frac{d}{dx}\sqrt{-5-3x}$