. Or have I? If you think one of these steps is wrong, input your answer as the step number.
I have found a proof that
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Step 6:
Step 7:
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
The calculation rule a × b = a b is only valid for real, non-negative values of a and b . Therefore step 5 is invalid.
Source: Wikipedia: Imaginary Unit