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Math Help - Pre-Calc

  1. #1
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    Pre-Calc

    cos(3x+Pie)=Radical 2/2

    Sorry i dont know how to do the signs...

    Thank you.
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  2. #2
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    Quote Originally Posted by ep78 View Post
    cos(3x+Pie)=Radical 2/2

    Sorry i dont know how to do the signs...

    Thank you.
    from the unit circle (with which you should be familiar) ...

    \cos\left(\frac{\pi}{4}\right) = \cos\left(\frac{5\pi}{4}\right) = \frac{\sqrt{2}}{2}

    so ... 3x + \pi = ?
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