If \cos \\alpha+\cos \\beta+\cos \\gamma=\sin \\alpha+\sin \\beta+\sin \\gamma=0then the value of \cos 3 \\alpha+\cos 3 \\beta+\cos 3 \\gamma is

Correct Answer is : 3cos(α+β+γ)

Manipal Entrance Test 2013 Math Paper

Question : 43 of 80

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If cos‌α+cos‌β+cos‌γ=sin‌α+sin‌β+sin‌γ=0then the value of cos‌3‌α+cos‌3‌β+cos‌3‌γ is

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