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

$\left(a+15\right)\left(a-5\right)$

$3x^2+6$

$\lim_{x\to0}\left(\frac{2^x-3^x}{x^1}\right)$

$\frac{x^2+3x+11}{x+1}$

$\frac{2\cdot\left(\frac{1}{x}\right)\cdot\sin\left(x\right)}{\left(\frac{1}{x}\right)\cdot\tan\left(x\right)}$

$x^2+60x+120$