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If ΔABC is an acute angled then prove that cos 2 A +cos 2 B +cos 2 C

If ΔABC is an acute angled then prove that


cos2A +cos2B +cos2C < 3/2

Grade:12

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
2 years ago
Dear student

For equilateral triangle the LHS = 3/2 != RHS

Kindly check and repost

Regards

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