goformit100
  • goformit100
The sum of the direction cosine of z-axis is ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
could you please elaborate on your question
goformit100
  • goformit100
Sir this much is the question.
anonymous
  • anonymous
The question is incorrect.

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More answers

goformit100
  • goformit100
No sir I have given the question from a book.
anonymous
  • anonymous
do you know what direction cosines are?
goformit100
  • goformit100
yes...... but unable to solve it :(
anonymous
  • anonymous
well what is it?
dape
  • dape
Wouldn't it just be zero? If we do it in cartesian coordinates the dot product of the unit vectors with the z-axis will all be zero, except the z unit vector. The direction cosine is thus the solution to \(\cos x=1\), which is zero (if we disregard the "whole turn" solutions). So the sum must also be zero.
dape
  • dape
But from the definition of direction cosines it seems pretty trivial.
anonymous
  • anonymous
@dape the direction cosine of z axis would be cos 90 and sum is a function that takes two parameters the question is invalid
dape
  • dape
Yeah, the question is not clear at all.
goformit100
  • goformit100
Ok... I'll talk to the teacher tomorrow. Thanks Anyways

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