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If A + B + C = 2S then prove that cosS + cos(S-A) + cos(S-B)-cos(S-c)=?

If A + B + C = 2S then prove that  cosS + cos(S-A) + cos(S-B)-cos(S-c)=?

Grade:10

1 Answers

Nishant Vora IIT Patna
askIITians Faculty 2467 Points
7 years ago

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