$\left(7x+2\right)\left(2x^2-x-4\right)$

$\int\frac{x+4}{x+3}dx$

$\frac{1-\cos\left(\theta\right)}{1+\cos\left(\theta\right)}=\csc\left(\theta\right)^2-\cot\left(\theta\right)^2$

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

$\lim_{x\to0}\left(\frac{-5x^2-\frac{1}{12}x^4}{x^2}\right)$

$2cos^4x-cos^2x=0$

$\left(x+10\right)\:\left(x+8\right)\left(x+6\right)$