a¯,b¯,c¯ are vectors of equal magnitude and (a,b)=α, (b,c)=β, (c,a)=γ⇒min. Value of cosα+cosβ+cosγ is ____

a¯,b¯,c¯ are vectors |a|=|b|=|c|It is equilateral Δ⇒θ=π/3 or 2π/3. For min=cos2π3+cos2π3+cos2π3=−3/2.

a¯,b¯,c¯ are vectors of equal magnitude and (a,b)=α, (b,c)=β, (c,a)=γ⇒min. Value of cosα+cosβ+cosγ is ____

a¯,b¯,c¯ are vectors |a|=|b|=|c|It is equilateral Δ⇒θ=π/3 or 2π/3. For min=cos2π3+cos2π3+cos2π3=−3/2.

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$\bar{a}, \bar{b}, \bar{c}$ are vectors of equal magnitude and $(a, b) = α, (b, c) = β, (c, a) = γ \Rightarrow \min .$ Value of $\cos α + \cos β + \cos γ$ is ____

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$\frac{3}{2}$

$- \frac{3}{2}$

$\frac{1}{2}$

$- \frac{1}{2}$

answer is B.

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$\bar{a}, \bar{b}, \bar{c}$ are vectors $| a | = | b | = | c |$

It is equilateral $Δ \Rightarrow θ = π / 3 o r 2 π / 3 .$ For $\min = \cos \frac{2 π}{3} + \cos \frac{2 π}{3} + \cos \frac{2 π}{3} = - 3 / 2 .$

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a¯,b¯,c¯ are vectors of equal magnitude and (a,b)=α, (b,c)=β, (c,a)=γ⇒min. Value of cosα+cosβ+cosγ is ____

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$\bar{a}, \bar{b}, \bar{c}$ are vectors of equal magnitude and $(a, b) = α, (b, c) = β, (c, a) = γ \Rightarrow \min .$ Value of $\cos α + \cos β + \cos γ$ is ____