$\left(0.5a^2+0.2b\right)\left(0.5a^2-0.2b\right)$

$x\left(x+1\right)\frac{dy}{dx}-y=2x^2$

$\frac{x^8-1}{x^6}$

$\lim_{x\to3}\left(\frac{\sqrt{x}-\sqrt{3}}{x^2}\right)$

$\left(\frac{x-5}{2}\right)-x=\frac{x+5}{3}$

$\left(4+b\right)\left(b-8\right)$

$\int_0^2\left(6x^2y\right)dy$