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Please prove the following identityCos 4x=1+8cos^4x-8cos^2x

Please prove the following identityCos 4x=1+8cos^4x-8cos^2x

Grade:11

2 Answers

kumar
14 Points
4 years ago
cos4X = cos(3x +x) = cos
kumar
14 Points
4 years ago
cos4X = cos(3x +x) = cos3x. cosx – sin3x. sinx then use forumla for cos3x and sin3x and convert all terms in cosine format

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