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Let veca ,vecb , vecc be three unit ve...

Let ` veca ,vecb , vecc` be three unit vectors such that angle between ` veca and vecb is alpha , vecb and vecc " is " beta and vecc and veca " is " gamma. " if " | veca. + vecb + vecc| =2` , then ` cos alpha + cos beta + cos gamma ` =

A

a-1,b-2,c-3

B

a-1,b-3,c-2

C

a-3,b-2,c-3

D

a-2,b-3,c-1

Text Solution

Verified by Experts

The correct Answer is:
C
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