Is the function $\frac{e^z-1}{e^z+1}$ analytic?
I tried using $\mathop{\lim}\limits_{z\to a} \frac{f(z)-f(a)}{z-a}$, but I didnt really know what to use for $a$.
Is the function $\frac{e^z-1}{e^z+1}$ analytic?
I tried using $\mathop{\lim}\limits_{z\to a} \frac{f(z)-f(a)}{z-a}$, but I didnt really know what to use for $a$.