# Trigonometric Identity

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If Z1= R1(cosx1+sinxI) and Z2= (cosx2+sinxI) How do you prove that Z1 multiplied by Z2 = R1 multiplied by R2(Cos(x1+x2)+sin(x1+x2)I).

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If Z1= R1(cosx1+sinxI) and Z2= ...

#### Solution Summary

A trigonometric identity is proven.

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