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)) Equation of their common line is

Answer»

`(X)/( sin theta) = (y)/(sin theta) = (Z)/( sin psi )`
`(x)/( COS theta ) = (y)/( cos psi) = (z)/(cos psi ) `
`(x)/( TAN theta) = (y)/(tan phi) = (z)/(tan psi) `
`(x)/(cot theta ) = (y)/( cot phi ) = (z)/(cot psi )`

Answer :B


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