$\frac { x ^ { 2 } - 36 } { x - 6 }$

$\frac{dy}{dx}=2y-4x+8xy-1$

$\left(3-x^5\right)\left(9+3x^5+x^{10}\right)$

$\left(3x+5y+10z\right)\left(3x+5y-10z\right)$

$y^2=4tx$

$\sin\left(x\right)\cot\left(x\right)=\csc\left(x\right)$

$7-7cos\left(x\right)=sin^2\left(x\right)$