$10cos\left(x\right)^2+11cos\left(x\right)+3=0$

$8x^2\:-\:128$

$\int x\left(\frac{3x^2}{7}-\frac{10}{3}x^4\right)dx$

$\lim_{x\to a}\left(\frac{\frac{1}{a}-\frac{1}{x}}{a-x}\right)$

$\sqrt{72a^3}+\sqrt{8a^3}-a\sqrt{18a}$

$\left(3\right)x\left(8\right)x\left(-2\right)$

$\int x\cdot\frac{1}{2x^3}dx$