$\left(2x^2+4x-8\right)+\left(x^2-3\right)$

$3x^2+x-6>0$

$\lim_{x\to\infty}\left(\frac{6x^2-12x}{x-2}\right)$

$125a^6-b^3$

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

$\frac{10}{13}+\frac{3}{13}$

$\int\left(\frac{1}{2\sin\left(x\right)-\cos\left(x\right)-2}\right)dx$