$\left(\frac{5}{6}m^3-\frac{2}{3}n^2\right)\left(\frac{5}{6}m^3+\frac{2}{3}n^2\right)$

$x^2+2x=35$

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

$\frac{d^2}{dx^2}\left(\frac{1}{2}x^2e^x\right)$

$\left(x^4y^2-5xy\right)\left(2xy-4x\right)$

$\int_0^{x+y}seno\left(2x+3y+4z\right)dz$

$\int_0^{3\pi}\left(x^2\cos\left(x\right)\right)dx$