$\int\frac{4}{5x^{3}}dx$

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

$\frac{dy}{dx}+3x=2$

$\int\frac{5x^2+6x+9}{\left(x^2+1\right)^2}dx$

$\left(2x+3\right)+\left(2y-2\right)\left(\frac{dy}{dx}\right)=0$

$cos\left(x\right)+\tan\left(x\right)=csc\left(x\right)sec\left(x\right)$

$2\cos^2x-\cos\left(x\right)$