$300\cdot9$

$\lim\:_{x\to\:\infty\:}\left(\frac{x^2+2x+3}{x-1}\right)$

$\int\left(\frac{1}{x\left(3-\ln\left(x\right)\right)}\right)dx$

$\frac{\left(3x-4\right)}{x}+\frac{x}{3x-4}$

$\lim_{x\to0}\left(\frac{1-\cos\left(4x\right)}{x}\right)$

$\int\left(\frac{cosx}{sen^2x+8}\right)dx$

$0 < 4 n + 1$