Q.
If O is the origin and the line OP of length r makes an angle α with x- axis and lies in the xz- plane, then the coordinates of P are
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a
0,0,rsinα
b
cosα,0,0
c
rcosα,rsinα,0
d
rcosα,0,rsinα
answer is D.
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Detailed Solution
If a P point lines on the xz-plane then the coordinates of the point P can be taken asx,0,zGiven the angle made by the line with x-axis is and the α angle made by the same line with z- axis is 90°−α Therefore, the coordinates of the point Prcosα,0,rsinα
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