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Math Help - Trig identity problem

  1. #1
    Newbie
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    Oct 2008
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    Trig identity problem

    I have a problem as follows:

    cos((π/3) - X)

    I then used the addition identity of cos(x-y) = cos x cos y + sin x sin y and got:

    cos(π/3)*cosX + sin(π/3)*sinX

    Then i used the unit circle to get

    (1/2)*cosX + √(3)*sinX

    And am now stuck. I'm supposed to solve for 'x' but i'm not sure how to continue.
    Help please?
    -I'm supposed to use trig identities, of course.
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  2. #2
    MHF Contributor kalagota's Avatar
    Joined
    Oct 2007
    From
    Taguig City, Philippines
    Posts
    1,026
    you cannot solve for x unless \cos (\pi/3 - x) is equated to some value..
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