Question

prove that : Cos 5x + cos 4x / 1 -2 cos 3x =- cos 2x - cos x.

Answer 1

Answer:

• cos 5x +cos 4x /1-2cos 3x
• Integration of (cos 5x-cos 4x)/(1-2cos 3x).
• ... the following function (cos 5x + cos 4x )/ 1- 2cos 3x ?
• ... do this? (integral) { (cos 5x + cos 4x) / (1 - 2cos 3x) }
• Prove that: Cos 5x = 2cos 3x - 11cos x

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