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Math Help - Inequality help

  1. #1
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    Inequality help

    hi i don't know how to solve this inequality with the absolute value
    thanks for your help
    Inequality help-1.gif

    answers are:

    Inequality help-2.gif

    Inequality help-3.gif
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  2. #2
    MHF Contributor Also sprach Zarathustra's Avatar
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    1-2sin^2(x)=cos(2x)
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