$\lim_{x\to\infty}\left(\frac{x+lnx}{x^2+3}\right)$

$\lim_{x\to\infty}\left(\frac{8x^4-3x^2-3}{3+5x^2+4x^5}\right)$

$3n-1>8$

$\left(a+5\right)\left(a-2\right)$

$\sin\left(a\right)=\frac{\cos\left(a\right)}{\cot\left(a\right)}$

$\frac{d}{dx}\left(\arctan\left(\frac{2+x}{1-2x}\right)\right)$

$\frac{dr}{ds}=e^{r-6s}$