$\frac{dy}{dx}=mx$

$\left(m-7\right)^2-\left(m+7\right)^2$

$\lim_{x\to1}\left(\frac{1-x+ln\left(x\right)}{1+cos\left(7\pi x\right)}\right)$

$\frac{x-1}{x^2+x}-\frac{1}{2x-2}-\frac{1}{2x+2}$

$2x^2-x+5=6$

$\tan^{-1}\left(\tan\left(\frac{7\pi}{8}\right)\right)$

$15\cot x+17\cos x$