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If a lne makes angles. 90^@, 135^@, 45^@...

If a lne makes angles. `90^@, 135^@, 45^@` with the x,y and Z−axes respectively, find its direction cosines.

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The correct Answer is:
The d.c.'s of the line are `cos90^@, cos135^@, cos45^@` I,e., `0, -(1)/sqrt2, (1)/sqrt2`
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