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

$\int_1^2x\ln\left(x\right)dx$

$\int_1^{\infty}\left(\frac{ln\:x}{x^2}\right)dx$

$\int_0^1xlnxdx$

$\int_0^1x\ln\left(x\right)dx$

$\frac{d}{dx}\left(\sqrt{\frac{x\left(x+2\right)}{\left(2x+1\right)\left(5x+3\right)}}\right)$

$\frac{d}{dx}\left(\frac{5}{x}\right)$