6. Elementary Functions

Exponential function: $\exp (x)={\mathrm{e}}^x=\underset{n\to \infty }{\lim }{\left(1+\frac{x}{n}\right)}^n$

Odd function: $f(-x)=-f(x)$ (ex. $\sin$) Even function: $f(-x)=f(x)$ (ex. $\cos$)