$\lim_{x\to2}\left(\frac{x^2+x+1}{x^2+x-6}\right)$

$\left(\frac{1+cos\left(2x\right)}{sin\left(2x\right)}\right)tan^2x=\tan\left(x\right)$

$1+\cos\left(\frac{n}{7}\right)=0$

$4\left(5\right)^2+16\left(3\right)-10$

$\sqrt[5]{-1x-32x-100000}$

$6\left(x+2\right)\left(x+3\right)$

$3\frac{-8}{-3}$