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If the position vectors of the vertices A,B and C of `Delta ABC` are `hati+2hatj-5hatk,-2hati+2hatj+hatk and 2hati+hatj-hatk` respectively, then `angle B=`

A

`cos^-1(7/(3sqrt10))`

B

`cos^-1(8/(105))`

C

`cos^-1(1/sqrt42)`

D

`cos^-1(-7/(3sqrt10))`

Text Solution

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The correct Answer is:
B
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