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Solve the following equality : cos2v=cos40

User Logaretm
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1 Answer

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Take the inverse cosine of both sides.

... arccos(cos(2v)) = arccos(cos(40°))

... 2v = ±40° + k·360° . . . . . for k = any integer

... v = ±20° + k·180° . . . . . . for k = any integer

Solve the following equality : cos2v=cos40-example-1
User Psyche
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