$m^2-15m+54$

$\left(x+3\right)^{-1}\cdot\cos\left(y\right)-\left(sen\left(y\right)\cdot ln\left(5x+15\right)-\frac{1}{y}\right)\cdot\frac{dy}{dx}=0$

$\lim_{x\to4}\left(3x+1\right)$

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

$\left(mn-p^2\right)\left(mn+p^2\right)$

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

$\left(\sqrt{3}x+y\right)\left(\sqrt{3}x-y\right)$