$12y^8-2y^8+8y^8$

$3\left(-4x+5y\right)b-\left(-4x+5y\right)a^2$

$\int\frac{2x^5}{\sqrt{5-4x^6}}dx$

$\lim_{x\to2}\left(\frac{2-x^2}{3-\sqrt{x^2+5}}\right)$

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

$\sqrt{\left(21\right)}^2$

$\int\sin\left(x\right)\cdot\left(\sec\left(x\right)+\tan\left(x\right)\right)dx$