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Math Help - Trig problem

  1. #1
    paubri
    Guest

    Trig problem

    Given the equation: 1/cotx, for what values of x will the equation be undefined. I am not sure is 180 degrees is an option, because if you substitute it into 1/(1/tanx), the denominator becomes undefined. Does this render the whole equation undefined or =0?
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  2. #2
    Newbie
    Joined
    Apr 2005
    Posts
    20
    1/1/tanx is just tanx

    you need to find for which angles tanx is undefined.
    tan x is sinx/cosx which is undefined whenever cosx = 0

    which I beleive is n*180 + 90
    or 90 ... 270 ... 450 ... etc.

    see the attached graph of sine in radians.
    Attached Thumbnails Attached Thumbnails Trig problem-tangraph.gif  
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