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Math Help - unit circle

  1. #1
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    unit circle

    how do you find tan(cos-1(1/3)) if it's not on the unit circle?
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  2. #2
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    Let \phi  = \arccos (1/3) so \cos (\phi ) = 1/3.
    Look at the diagram. What is \tan (\phi ) = ?
    Attached Thumbnails Attached Thumbnails unit circle-acos.gif  
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