Q 2166678575.     The plane `lx + my = 0` is rotated about its line of

intersection with the `x O y` plane through an angle `alpha`. Then

the equation of the plane is `lx + my + nz = 0`, where n is

A

`pm sqrt (l^2 + m^2) cos alpha`

B

`pm sqrt ( l^2 +m^2) sin alpha `

C

`pm sqrt ( l^2 +m^2) tan alpha `

D

None of these

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