$\left(1-3ax\right)x\left(1+3ax\right)$

$3x^2y-2xy$

$\int cos\left(x\right)\sin\left(x\right)\cos\left(x\right)\sin\left(x\right)\cos\left(x\right)\sin\left(x\right)\cos\left(x\right)dx$

$\lim_{x\to3}\left(\frac{\left(2x^2+x-3\right)}{3x-9}\right)$

$4a^2-8a+16$

$\frac{dy}{dx}\left(2x-y+\sin\left(2y\right)\right)$

$6x^2+13x+6=0$