Math, asked by Sewantyupreti, 10 months ago

Can anyone tell me formula of Cos8A

Answers

Answered by sg249344

How to proof the formula of cos 2A is equals 2 cos2 A - 1? (ii) In the above formula we should note that the angle on the R.H.S. is half of the angle on L.H.S. Therefore, cos 120° = cos2 60° - sin2 60°.

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