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AP EAMCET Engineering 2018 Apr 22 Shift 2 Paper

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Question : 22

Total: 160

If α,β,γ are any three angles, then cos‌α+cos‌β−cos‌γ−cos(α+β+γ)=

4‌cos‌
α+β
2
‌cos‌
β+γ
2
‌cos‌
γ+α
2
4‌cos‌
α+β
2
‌sin‌
β+γ
2
‌sin‌
γ+α
2
4‌cos‌
α+β
2
‌sin‌
β−γ
2
‌sin‌
γ−α
2
4‌sin‌
α+β
2
‌cos‌
β+γ
2
‌cos‌
γ+α
2

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