Math, asked by labonnoroybachelor, 4 months ago

(ii) cos^(3)x + cos^(3) (60° - x) + cos^(3) (60° + x)=1/4 (6 cosx - cos3x)

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Answered by isfakulali

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Answer:

xviii) 4cosx × cos(x+60)+cos×cos(60)=cos3x prove that

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