$\frac{d}{dx}\left(\left(tan^{-1}\left(7x\right)\right)^2\right)$

$\int\cos\left(\ln\left(4x\right)\right)dx$

$\left(4^4\right)\left(^34\right)$

$\frac{x^2+7}{\left(x-1\right)\left(x^2+2x-3\right)}$

$sec^2\:a\left(1-sin^2\:a\right)=1$

$2x^2-x+11\le3$

$\left(x^2+3x+1\right)\left(2\right)+\left(5x-7x-4\right)\left(2\right)$