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If the angle between the planes `bar( r ).(m hati-hatj+2hatk)+3=0" and "bar( r ).(2hati-m hatj-hatk)-5=0` is `(pi)/(3)`, then m =

A

2

B

`+-3`

C

3

D

`-2`

Text Solution

Verified by Experts

The correct Answer is:
C
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