$\frac{d^2}{dx^2}\left(\frac{1}{2}\cdot\:\sin\:\left(\frac{x}{3}\right)\right)$

$2\sqrt{x^5}-2\sqrt{x}$

$log5\left(25x+5y\right)$

$\lim_{x\to5}\left(0.01\right)$

$2\left(x+4\right)+\:3\left(x-1\right)>4\left(x-8\right)$

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

$2x-4\le x+1$