$\frac{8n^3-1}{2n-1}$

$\frac{dy}{dx}=\frac{-\left(y^2e^x+1\right)}{2ye^x+3y^2}$

$\lim_{x\to-3}\left(\frac{x^2-4x-3}{x^2-9}\right)$

$\left(4x^2+4x\right)-\left(3x+1\right)^2$

$\int_2^{\infty}\left(\frac{tan^{-1}\left(x\right)}{x^2}\right)dx$

$13-\left[15-\left(6-8\right)+\:\left(5-9\right)\right]$

$\left(3x^4+5x^3\right)\left(-8x^4+5x^3\right)$