1.

The plane 2x + 3y -2sqrt(3)z + 25 = 0 makes an angle.......with X-axis.

Answer»

`sin^(-1) ""(2)/(sqrt(21))`
`TAN^(-1)""(2)/(sqrt(21))`
`sin^(-1)""(1)/(sqrt(21))`
`cos^(-1)""(1)/(21)`

ANSWER :B


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