For complex numbers z, let
f(z) = 2z if z is not real
f(z) = iz if z is real
Find f(i) + f(1) + f(-1) + f(-i).
f(i) = 2i (since i is not real)
f(1) = 1i (since 1 is real)
Solve the other 2 values and add them up.
*You could also solve this problem by noticing that for every f(x) term, there's also a f(-x).
=^._.^=
