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## Main Question or Discussion Point

I need help getting this one started... PLEASE...

Given x=r(cos U + i sin u) and y =t(cos v + i sin v):

Prove tha tthe modulus of (xy) is the product of their moduli and that the amplitude of (xy) is the sum of their amplitudes.

Given x=r(cos U + i sin u) and y =t(cos v + i sin v):

Prove tha tthe modulus of (xy) is the product of their moduli and that the amplitude of (xy) is the sum of their amplitudes.