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sin^2 A+sin^2 B+sin^2 C=2+2cosAcosBcosC, How do you prove this question?

sin^2 A+sin^2 B+sin^2 C=2+2cosAcosBcosC,
How do you prove this question?

Grade:11

1 Answers

Nishant Vora IIT Patna
askIITians Faculty 2467 Points
7 years ago
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after this apply cos 2A + cos 2B formula

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