Hey Tutu.
What did you get for your answer in a) ?
That doesn't seem right: if that is the case then it means that the arguments are the same and the moduli is the same for num cerator and denominator since:
Arg = Arg1 - Arg2 = 0 and Mod = Mod1/Mod2 = 1 for division.
This would imply that they are equal to each other.