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What are the direction cosines of the y-axis?

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What are the direction cosines of the y-axis?

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Text solutionVerified

If

α, β,

and

γ

are the angles made by the line segment with the coordinate axis.

cos α, cos β

and

cos γ

are called as the direction cosines and are usually denoted by

l, m

and

n .

l = cos α, m = cos β

and

n = cos γ

Clearly the y-axis makes an angle of

90^{o}, 0^{o}, 90^{o}

ie., with the x-axis, y-axis, z-axis respectively

so its direction cosines are

cos 90^{o}, cos 0^{o}, cos 90^{o}

ie.,

0, 1, 0

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Question Text	What are the direction cosines of the y-axis?
Answer Type	Text solution:1
Upvotes	150