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Homework Help: Find angle that satisfies the following

  1. Jun 5, 2012 #1
    I get how to go from 5 to 6 (set cosα=0) but how do you get 7?

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  2. jcsd
  3. Jun 5, 2012 #2

    D H

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    Use (6) in conjunction with cos(α)≠0.
  4. Jun 5, 2012 #3
    OHHH thanks! :D
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