$4-\left(6+\left(-5\left(12-8\right)\right)\right)$

$\int_{\frac{\pi}{6}}^{\frac{\pi}{4}}\frac{csc2x}{3}dx$

$2x+7x-x-2y-3x-5$

$\left(a^7+11\right)^2$

$\frac{a^3+8}{a^2-4a+4}.\frac{a^3-64}{a^2+4a+4}$

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

$\lim_{x\to\infty}\left(\frac{10x^3+3x^2+x-4}{2x^3-x+12}\right)$