1.

If the line OP of length r makes an angle alpha with the X - axis , and lies in the ZX - plane , then the co - ordinates of P are

Answer»

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

ANSWER :a


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