With the problem 2/(1-i) * (1+i)/(1+i),
since (1+i)/(1+i) cancels out to a one, if you multiply one times 2/(1-i), don't you just get 2(1-i)??
For some reason, the answer is l+i.
Why can't you just make (1+i)/(1+i) equal one?
monjinho wrote:...if you multiply one times 2/(1-i), don't you just get 2(1-i)??