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Find the value of p, if the planes barr ...

Find the value of p, if the planes `barr *(phati - hatj + 2hatk) + 3 = 0` and
`barr*(2hati - phatj - hatk) -5 = 0` include an angle of `(pi)/(3)`.

A

`1,-3`

B

`-1,3`

C

`-3`

D

3

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The correct Answer is:
D
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