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

$\cos^4\left(x\right)\:\sec^3\left(x\right)$

$\lim_{x\to0}\left(\frac{\ln\left(4x+1\right)}{\ln\left(2x+1\right)}\right)$

$2\sin^2\left(x\right)=5\sin\left(x\right)-3$

$\frac{d}{dx}y=7a^2w$

$\left(5m-7\right)^2-\left(2m-3\right)^2$

$\int_0^{\infty}\left(345\right)dx$