What is the cosine of angle between the planes `x+ y + z + 1 = 0` and `2x -2y + 2z + 1= 0` ?

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Q 2349445313.     What is the cosine of angle between the planes
`x+ y + z + 1 = 0` and `2x -2y + 2z + 1= 0` ?
NDA 2012 Paper 1
A

`1/2`

B

`1/3`

C

`2/3`

D

None of these

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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