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Let p=hati+2hatj-hatk,q=2hati-hatj+hatk....

Let `p=hati+2hatj-hatk,q=2hati-hatj+hatk`. If a and b are two vectors such that `p=a-2b,q=2a+b`, then the angle between a and b is

A

`cos^(-1)((3)/(2sqrt(221)))`

B

`(pi)/(2)`

C

`cos^(-1)""(7)/sqrt(143)`

D

`(pi)/(3)`

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The correct Answer is:
A
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