$\frac{\sqrt{2sec\left(x\right)-4}}{2sec\left(x\right)}$

$\left(6x+7\right)+\left(4x+5\right)\left(4x+6\right)$

$\frac{x^3-8y^6}{x+2y^2}$

$\lim_{x\to\pi}\left(\frac{1+\cos\left(3x\right)}{\left(x-\pi\right)^2}\right)$

$\int\left(4-x^2\right)x^2dx$

$49y^2+28yz+4z^2$

$\lim_{x\to0}\left(\frac{\left(e^x-e^{-x}\right)}{2sinx}\right)$