Let a and b be two unit vectors inclined at an angle \[\theta \], then \[\sin \,(\theta /2)\] is equal to [BIT Ranchi 1991; Karnataka CET 2000, 01; UPSEAT 2002]

Let a and b be two unit vectors inclined at an angle \[\theta \], then

1.	Let a and b be two unit vectors inclined at an angle \[\theta \], then \[\sin \,(\theta /2)\] is equal to [BIT Ranchi 1991; Karnataka CET 2000, 01; UPSEAT 2002]
A.	\[\frac{1}{2}\|a-b\|\]
B.	\[\frac{1}{2}\|a+b\|\]
C.	\[\|a-b\|\]
D.	\[\|a+b\|\]
Answer» B. \[\frac{1}{2}\|a+b\|\]

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Let a and b be two unit vectors inclined at an angle \[\theta \], then \[\sin \,(\theta /2)\] is equal to [BIT Ranchi 1991; Karnataka CET 2000, 01; UPSEAT 2002]

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