CGPET 2018 Solved Paper

The line OP of length r makes an angle α with X -axis and lies in the XZ -plane. Coordinates in Y -axis is zero.
and X -axis respect coordinates =r‌cos‌α
and Z -axis respect coordinates =r‌cos(90−α) =r‌sin‌α
Hence, coordinates of P=(r‌cos‌α,0r‌sin‌α)