Solve the multiple angle equation

Kenneth S. answered • 04/03/16

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so 2 cos 5x = 1 or cos 5x = 1/2. what angles have cosine 1/2? ±60^o + k(360^o) where k is any integer.

Therefore 5θ = ±60^o + k(360^o)

so θ = ±12^o + k(72^o) after dividing the entire right side by 5.

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