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If a line makes angles. 90^@, 60^@, 30^@...

If a line makes angles. `90^@, 60^@, 30^@` with the x, y and z axes respectively,
find its direction cosines

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The correct Answer is:
`cos90^@, cos 60^@, cos 30^@` i.e., 0, (1)/2, (sqrt3)/2`
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A N EXCEL PUBLICATION-THREE DIMENSTIONAL GEOMETRY-QUESTION BANK
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