$\left(\sec\left(\theta\right)+1\right)\left(\sec\left(\theta\right)-1\right):\sec\left(\theta\right)$

$\frac{dy}{dx}=\frac{x}{y},y\left(0\right)=-1$

$5s^2+25s+180=0$

$e^{x^2}=4$

$\frac{8a^9+b^9}{2a^3+b^3}$

$2x^2y^3\:+\:8xy^2z\:-\:16x^3y^4$

$\frac{a^3-3a^2-a+3}{a-2}$