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in Three Dimensional Geometry by (46.3k points)

Find the direction cosines of a line which makes equal angles with the coordinate axis.

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Best answer

Let the line makes equal angle 0 with the coordinate axis. 

∴ Direction cosines are 

l = cos θ, m = cos θ, n = cos θ 

but l2 + m2 + n2 = 1

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