1.

If the three plane x = y sin psi+ z sin phi, y = z sin theta + x sin psi, z = x sin phi + y sin theta, intersect in a line, then where theta, phi in (0, (pi)/(2)) theta + phi + psi =

Answer»

`90^(@)`
`120^(@)`
`150^(@)`
`180^(@)`

ANSWER :A


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