Math, asked by harshith456255, 6 hours ago

cos2A in terms of cos a is what

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Answered by blackcat39

(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°. ... Now, we will apply the formula of multiple angle of cos 2A in terms of A to solve the below problems.

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