The angle beween the lines hatr=(2hati-3...

The angle beween the lines `hatr=(2hati-3hatj+hatk)+lambda (hati+4hatj+3hatk) and hatr= (hati-hatj+2hatk)+mu (hati+2hatj-3hatk)` is

A

`pi/2`

B

`cos^(-1)((9)/(sqrt91))`

C

`cos^(-1) ((7)/(sqrt84))`

D

`pi/3`

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A

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