How to multiply complex numbers in trigonometric form?

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gleendo2018-11-12 22:35:10

Mathematics

gleendo, 2018-11-12 22:35:10

How to multiply complex numbers in trigonometric form?

Please tell me how from what is highlighted in red, it turned out what is highlighted in pink?

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longclaps, 2018-11-12
@evgeniy8705

Didn't the master of the universe learn the sine/cosine formula for the sum of angles in school?
Oh well, why would he?

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