$-\left[1+2-3-4-\left(5-6+7\right)+8\right]-9\cdot\left(-10\right)-11$

$9m^2+36m+36$

$2x^2+3x-x^2-x$

$\frac{dy}{dx}=\frac{5x^2}{4y\left(x^3+4\right)}$

$\lim_{x\to\infty}\left(5x^4-2+9x-x^3\right)\:\:$

$li\lim_{x\to0}\left(1+sinx\right)^{\cot\left(x\right)}$

$\lim_{x\to\frac{\pi}{3}}\left(\frac{sinx-cos2x}{cosx}\right)$