1.

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

Answer»

A`(3)/(2)`
B`-(3)/(2)`
C`(1)/(2)`
D`-(1)/(2)`

ANSWER :B


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