If a line `OP` of length `r` (where, `O` is the origin) makes an angle `alpha` with `X`-axis and lies in the `XZ`-plan

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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
A

`(r cos alpha , 0, r sin alpha)`

B

`(0, 0, r sin alpha)`

C

`(r cos alpha , 0, 0)`

D

`(0, 0, r cos alpha)`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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