$4\int\left(\frac{e^x-1}{3x}\right)dx$

$\int cos\left(13-6x\right)dx$

$\left(x+\sqrt{5}\right)\left(x-\sqrt{2}\right)$

$\int\frac{1}{x\left(1200+x\right)}dx$

$\left(2m^3+y^3\right)\left(4m^6-2m^3y^3+y^6\right)$

$\frac{2a^3b^5}{3}\cdot\frac{-7a^2b}{4}$

$\frac{dy}{dx}=-3x^2y=x^2$