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### Question Asked by a Student from EXXAMM.com Team

** Q 2166880775. ** Let `PM` be the perpendicular from the point `(1, 2, 3)` to

`x - y` plane. If `OP` makes an angle e with the positive

direction of the `z`-axis and `OM` makes an angle `phi` with the

positive direction of `x`-axis, where `O` is the origin then

`( theta` and `phi` are acute angles)