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Q 2319134019.     If a line `OP` of length `r` (where, `O` is the origin)
makes an angle `alpha` with `X`-axis and lies in the
`XZ`-plane, then what are the coordinates of `P`?
NDA 2012 Paper 1
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)