1.

Let alpha,betaandgamma be the angles made by a line with the positive directions of the axes of reference in three dimensions. If theta is the acute angle given by costheta=(cos^(2)alpha+cos^(2)beta+cos^(2)gamma)/(sin^(2)alpha+sin^(2)beta+sin^(2)gamma), then theta equals.

Answer»

`pi//6`
`pi//3`
`pi//2`
`pi//4`

ANSWER :B


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