$-3+4-8+2+4$

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

$2x^2-x+4x^2-x^2$

$4\left(3s\right)$

$\left(x^3+9x^2+27x+27\right)-\left(x^3-9x^2+27x-27\right)$

$\int\left(\sqrt{2}\right)xdx$

$\lim_{x\to\infty}\left(\frac{\ln\left(x\right)}{2x+\ln\left(x\right)}\right)$