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    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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    https://brainmass.com/math/trigonometry/trigonometric-identity-function-37010

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

    Solution Summary

    A trigonometric identity is proven.

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