$\frac{1+\cos\:\left(\theta\:\right)}{\cos\:\left(\theta\:\right)}=\frac{\left(\tan\:\left(\theta\:\right)\right)^2}{\sec\:\left(\theta\:\right)-1}$

$4x-\frac{2}{9}x+\frac{x}{3}$

$\lim_{x\to\infty}\left(xsin\left(\frac{4}{x}\right)\right)$

$2x^2+12x+23$

$\left(4m+8\right)^2$

$2^3-3\left(2\right)^2-2\left(2\right)+12$

$140c+28-14a$