Kenneth S. answered • 08/09/17

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Your problem specifications are not written correctly; I certainly do not understand the question.

Whenever you write sin or cos, each must be followed by an argument. [Cosine of WHAT??]

OTHER THINGS ARE UNCLEAR AND YOU NEED TO WRITE THE MATHEMATICAL STATEMENTS BETTER.

DeMoivre's theorem is well known but this garbled question makes no sense, at present.