1.

The plane 2x - 3y + 6z + 9 =0 makes an angle with positive direciton of X -axis is ........

Answer»

`COS^(-1)""(3sqrt(5))/(7)`
`sin^(-1)""(3)/(7)`
`sin^(-1)""(2)/(sqrt(7))`
`tan^(-1)""(2)/(7)`

ANSWER :A


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