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Q.

If a half line OP¯  where OP¯  = r makes an angle α  with the positive X–axis OX¯ and lies in the XZ plane, then the coordinates of P are

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a

(0,rcosα, 0)

b

(rcosα,0,rsinα)

c

(rsinα,0,rcosα)

d

(0,rsinα,0)

answer is B.

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Detailed Solution

OQ = rcosα PQ  = r sinα P(rcosα, 0, rsinα)
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If a half line OP¯  where OP¯  = r makes an angle α  with the positive X–axis OX¯ and lies in the XZ plane, then the coordinates of P are