$\int\frac{1}{3x^2+1}dx$

$\frac{d}{dx}\left(\ln\left(x^2\right)+\left(ln\left(x\right)^3\right)\right)$

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

$\frac{dv}{ds}=\frac{s+1}{sv+s}$

$-4+\left(6+1\right)+3-\left(1-2\right)\left|+2\right|+1-7$

$a+\frac{c}{d-n}$

$\int\frac{2}{3}\:cos\left(8x-1\right)dx$