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If A + B + C = 2S then prove that 4cos(S-A/2)cos(S-B/2)cosC/2-1

If A + B + C = 2S then prove that  4cos(S-A/2)cos(S-B/2)cosC/2-1

Grade:10

1 Answers

Nishant Vora IIT Patna
askIITians Faculty 2467 Points
5 years ago
Question is not clear

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