$\frac{cos2x-cos^2x}{1+cos2x}\cdot cotgx$

$12\:x^2\:+\:4\:x^3\:+\:2x\:$

$m2+4m+4$

$7x^2yz-\frac{2}{3}xz^3-\frac{8}{2}y-\frac{6}{3}y-\frac{5}{3}xz^3+\frac{5}{2}xz^3$

$\lim_{x\to\infty}\left(\left(4x\right)^{-2}e^{8x}\right)$

$\int x^33^xdx$

$\int\sin\left(9x\right)^2cos\left(9x\right)^2dx$