$\left(\frac{9}{\left(3x+2\right)^2}\right)=3\left(-\frac{3}{3x+2}\right)^2$

$\int\:\frac{3sin^3x}{cos\left(x\right)}dx$

$\left(-13n^4+12n^3-3+8n^2\right)+\left(-11n^2-n^3\right)$

$\int r^2\left(\frac{r^3}{24}-8\right)^7dr$

$\frac{dy}{dx}+xy=e^{-x^2}\cdot y^{-3}$

$a^2+7a+13=0$

$2\left(sinx\right)^2-sinx=1$