$80a^5b^4c+16a^4b^2c^2+72a^2c$

$\left(\frac{secx}{cscx}\right)x\:ctgx$

$\frac{dy}{dx}\left(\frac{\left(\left(x^2+12\right)^5\left(x^3+17\right)^4\right)}{x-3}\right)$

$s^3+s^2+9s+9$

$9x+3y+4x+2y$

$\frac{dy}{dx}\left(yarctan\left(\frac{x}{2}\right)+arctan\left(\frac{2}{x}\right)\right)$

$3a^2\:-\:5b^2+\:10;\:a=-3;\:b=-6$