Question: Prove that two nonzero complex numbers z1 and z2 have the same moduli if and only if there are complex numbers c1 and c2 such

Prove that two nonzero complex numbers z1 and z2 have the same moduli if and only if there are complex numbers c1 and c2 such that z1 = c1c2 and z2 = c1c2.

and [see Exercise 2(b)]

exp(-)exp()- exp(ith) exp ( i__ ) exp(102).

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