If the angle between the planes ba...

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

`pm 3`

C

3

D

`-2`

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The correct Answer is:

C

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