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The angle between the planes represented...

The angle between the planes represented by `2x ^(2) - 6y ^(2) - 12 z^(2) + 18 yz + 2 zx + xy =0` is

A

`Cos ^(-1) ((-16)/(21))`

B

`Cos ^(-1) ((17)/(21))`

C

`Cos^(-1) ((19)/(21))`

D

`pi/2`

Text Solution

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The correct Answer is:
A
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