$7a^2+6a^2+-10a^2$

$\frac{3}{2}1.5$

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

$93a^3b^2c-63a^2b^3c^2-126a^2b+186ab^4c^2$

$\frac{d^2}{dx^2}\left(x^4\:y^2-x^3\:y\right)$

$\left(5x^5+5\right)\left(-2x^5-3\right)$

$\frac{\cos^3\left(22\right)-\cos\left(66\right)}{\cos\left(22\right)}+\frac{\sin^3\left(22\right)+\sin\left(66\right)}{\sin\left(22\right)}$