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how to prove that : 4 cos 3 20 – 3 cos 20=2 cos (3.20)

how to prove that :
4 cos 3 20 – 3 cos 20=2 cos (3.20)

Grade:11

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
Dear student

Please attach the question

Regards

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