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If a,b,c are vectors of equal magnitude such that (a,b)= `alpha`, (b,c)= `beta`, (c,a)= `gamma,` then the minimum value of cos `alpha +cos beta +cos gamma` is

A

A `(3)/(2)`

B

B `-(3)/(2)`

C

C `(1)/(2)`

D

D `-(1)/(2)`

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The correct Answer is:
B
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