$-7y^{2\:}-2y^{2\:}+y^3-3y-2y+5y^3-2y$

$f\left(x\right)=\left(x-3\right)\cdot\left(6\cdot x-4\right)$

$xz+y=1+z$

$\lim\:_{x\to\:0}\left(\frac{\left(e^x+e^{-x}\right)}{\cos\left(x\right)}\right)$

$\left(3x^2+2x-6\right)\cdot\left(4x^4\right)$

$\frac{d}{dx}x^3y^3=3$