User:Pt18378193

$$e^x=\sum_{n=0}^{\infty}\frac{x^n}{n!}$$

$$\text{sin}(x)=\sum_{n=0}^{\infty}(-1)^n*\frac{x^{2n+1}}{(2n+1)!}$$

$$\text{cos}(x)=\sum_{n=0}^{\infty}(-1)^n*\frac{x^{2n}}{2n!}

$$

$$n\text{!}\approx\sqrt{2*\pi*\frac{x^{2x+1}}{e^{2x}}}$$

User:Pt18378193/Finding the minima of (x^2+1)/x with x larger or equal to 2