# Trigonometric Identity

Not what you're looking for? Search our solutions OR ask your own Custom question.

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).

Â© BrainMass Inc. brainmass.com March 4, 2021, 6:15 pm ad1c9bdddfhttps://brainmass.com/math/trigonometry/trigonometric-identity-function-37010

#### Solution Preview

Please see the attached file for the complete solution.

Thanks for using BrainMass.

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

#### Solution Summary

A trigonometric identity is proven.

$2.49