$x^2mas\:y^2=7$

$\left(y^3+3y^2-6\right)\cdot\left(2y^2+3y\right)$

$12y^2-36y-21$

$x\left(y+2\right)+\left(y+2\right)$

$\left(5i+3\right)\left(2-2i\right)$

$\frac{1-\left(\sin\left(x\right)-\cos\left(x\right)\right)^2}{\sin^2\left(x\right)}=2\cot\left(x\right)$

$\left(\frac{1}{12}x+4\right)\left(\frac{1}{12}x-4\right)$