The angle between the planes 3x - 4y + 5z = 0 and 2x -y - 2z = 5 is [MP PET 1988]

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None of these

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Solution

The correct option is B

$θ = c o s^{- 1} [\frac{6 + 4 - 10}{\sqrt{10} \sqrt{9}}] = c o s^{- 1} (0) = \frac{π}{2}$ .

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