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if A+B+C=180 then prove that cos2A+cos2B-cos2C=1-4sinAsinBcosC

if A+B+C=180 then prove that   cos2A+cos2B-cos2C=1-4sinAsinBcosC

Grade:11

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4405 Points
3 years ago
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