$\frac{cos^2\left(\theta\:\right)}{csc^2\left(\theta\:\right)}$

$\frac{d^2}{dx^2}\left(18x^3-36x^2\right)$

$\frac{dy}{dx}=y^2\left(9-9x^2\right)$

$x^5\cdot\frac{dx}{dy}+y^5=0$

$\int_0^4\left(5\tan\left(2x\right)^2\right)dx$

$\int\frac{x^3\:\:\:\:}{\left(5x^4+2\right)^3}dx$

$2x^4-3x^2-2;\:x=2$