Political Science, asked by krishnanrnair7925, 7 months ago

Cos2 a +cos2 b - cos2
c = 1- 2sina sinb cosc

Answers

Answered by ramcharan90

0

Explanation:

cos²A + cos²B - cos²C = 1 - 2sinA sinB cosC. 2 ... sin²A + {cos(A-B+C) - cos(A+B-C) / 2} ... 1/2 { 2sin²A - cos2B + cos2C }

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