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November 01, 2025, 07:58:54 pm
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Author Topic: angle vector questions  (Read 662 times)  Share 

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TrueTears

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angle vector questions
« on: December 22, 2008, 12:34:57 am »
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1. Show that, if a vector in three dimensions makes angles a, b , c respectively with the x, y, z axes, then cos^2a + cos^2b + cos^2c = 1

« Last Edit: December 22, 2008, 02:07:46 pm by TrueTears »
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Re: angle vector questions
« Reply #1 on: February 07, 2009, 11:18:38 pm »
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I was also wondering how to do this question, anyone?
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Mao

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Re: angle vector questions
« Reply #2 on: February 07, 2009, 11:29:01 pm »
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(x,y,z) has a modulus of

then,

the unit vector is hence , which has a magnitude of 1.





QED
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