$1-cos^2x+cot^2x-cot^2xcos^2x$

$\frac{5-0}{4}+\frac{3+0}{2}\ge\frac{0}{6},0-\frac{0}{2}-\frac{0}{3}\le0$

$125-x^6$

$\int_{-\infty}^2\left(\frac{1}{x^2+4}\right)dx$

$7-3b-2\left(3\right)-3b$

$\ln\left(x\right)+\ln\left(x-4\right)=\ln\left(6x\right)$

$\lim_{x\to3}\left(\frac{\sqrt{x+1}-3}{x-3}\right)$