$\frac{cos\left(x\right)}{1-sin\left(x\right)}-\frac{1}{cos\left(x\right)}=tan\left(x\right)$

$\frac{dy}{dx}=\frac{-x+y}{-3y+3x}$

$\frac{x^3-2x^2-4x+8}{x^2-4}$

$2^3+5^3+6^2$

$y^2dy=x\left(senx+lnx\right)dx$

$\left(-3\right)^2-4\left(2\right)\left(-2\right)$

$\frac{\csc^2\left(x\right)}{\csc\left(x\right)+1}$