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Homework Help: Grade 12 trigonometry

  1. Apr 23, 2009 #1
    1. The problem statement, all variables and given/known data

    Solve the following equation:

    (2sinx-1)(tanx-1) = 0

    The answers are listed as :

    pi/6, 5pi/6, pi/4, 54/4

    2. Relevant equations

    I'm told the unit circle is used.

    3. The attempt at a solution

    I'm attempting to learn this from dijointed class notes for a class I missed....

    I iunderstand I need to use each bracket by itself, make rotations around the unit circle and find a certain value and use the x value...problemis, I have no idea how to get started. Could anyone shed some light on this frustrating topic?
  2. jcsd
  3. Apr 23, 2009 #2


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    Science Advisor
    Homework Helper

    Hi cybernerd! :smile:
    Yes, either (2sinx-1) = 0 or (tanx-1) = 0, so roots of either will do. :smile:
    Sorry, I've no idea what that means in this context …

    surely you just find the principal solution, and then use the ordinary ±180º equations? :confused:
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