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To prove This question Cos(a)+Cos(2a)+Cos(3a) =4Cos(3a)

To prove This question
Cos(a)+Cos(2a)+Cos(3a) =4Cos(3a)

Grade:12

1 Answers

Arun
25750 Points
5 years ago
Dear Sachin
 
cos A + 2 cos^2 A – 1 = 3 cos 3A
 
I think you have typed a wrong question. Please check and repost it

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