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if tan(x-y/2),tanz,tan(x+y/2) are in GP. Then prove that cosx=cosy+cos2z

if tan(x-y/2),tanz,tan(x+y/2) are in GP. Then prove that cosx=cosy+cos2z

Grade:10

1 Answers

Vijay Mukati
askIITians Faculty 2590 Points
6 years ago
I Think the question should be to prove cos x = cos y * cos 2z. Hint. Just use b2 =ac condition for GP of numbers a,b,c. Then Just do the simplification, You will get it.

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