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JEE Advanced 2020 Full Test 1 Paper 2

Paragraph for Question Nos. 53 and 54

If cos‌α+cos‌β+cos‌γ=0=sin‌α+sin‌β+sin‌γ and δ=‌

α+β+γ

. The difference of any two of the angles α,β,γ is equivalent to ‌

2π

. Then

Question : 54 of 54

Marks: +1, -0

then the cos‌12‌α+cos‌12‌β+cos‌12‌γ=

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