$\int\left(3x^3\sqrt{x^4+3}\right)dx$

$\lim_{x\to0}\left(\frac{x^2-6x}{x^2-4}\right)$

$7a\left(2a+b\right)+8b\left(2a+b\right)-4a\left(2a+b\right)$

$\left|-7\right|-\left|-\:8\right|$

$\left(-x^{4}-3x^{3}+2x^{2}-14x+1\right):\left(x^{2}+4x-1\right)$

$\int x^4\cdot9^x$

$\frac{d}{dx}8\sqrt[3]{x^5}-\frac{2}{5x^2}+\frac{2}{3}$