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# Finding the Direction Cosines

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Okay I have been racking my brain with this one for over a week and still have no clue how to do this.I need to study this for a test I am having and can't seem to figure this out

Consider an arbitrary 3D vector: A=Axx+Ayy+Azz
a) Determine the direction cosines for this vector. These are cos[&#61537;], cos[&#61538;] and cos [&#61543;], where &#61537; is the angle between A and x , where &#61538; is the angle between A and y, and &#61543; is the angle of A and z.

b) Show that the direction cosines obey the relationship (cos[&#61537;])2+(cos[&#61538;])2+(cos [&#61543;])2.

##### Solution Summary

The expert finds the direction cosines for vectors. The direction cosines obey in relationships are given.

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Consider an arbitrary 3D vector: A=Axx+Ayy+Azz
a) Determine the direction cosines for this vector. These are cos[], cos[] and cos [], ...

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