$7r\:-\:7r\:+\:2r$

$\frac{\left(x^5\right)}{x^2+x+1}$

$\int\frac{2x}{\left(\left(x^2-2\right)ln\left(3x^2-6\right)\right)}dx$

$\int_0^{\frac{1}{2}}\left(1-x^2\right)^{\frac{1}{2}}dx$

$\int\sqrt[3]{b+m}db$

$\frac{dy}{dx}\left(\cos\left(xy\right)=x+3y\right)$

$-6-6\cdot3$