#### david753

##### Full Member level 1

**e^jwt**

As you know, e^jwt=cos(wt)+j*sin(wt)

I can plot its diagram by mathlab.

And get the result of a sinusoidal.

But, when I try another numers, 2 or 3 instead of e in above equation.

The result is still like sinusoidal.

How to explain it?

j is key point, and j=sqrt(-1).

It is really beyond my imagination.