( {\r}, \theta) denotes r(\cos \theta+ {\i} \sin \theta). If {\x}=(1, a), {\y}=(1, \beta), {\z}=(1, \gamma) and {\x}+ {\y}+ {\z}=0 then \sum \cos (2 \alpha-\beta-\gamma)= [AP EAPCET 23 May 2024 S1]

AP EAPCET 23 May 2024 Shift 1 Solved Paper

Section: Mathematics

Question : 9 of 160

Marks: +1, -0

(r,θ) denotes r(cos‌θ+isin‌θ). If x=(1,a),y=(1,β),z=(1,γ) and x+y+z=0 then
∑cos(2α−β−γ)=

[AP EAPCET 23 May 2024 S1]

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