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Math Help - HELP!! 2 Trig Problems

  1. #1
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    Exclamation HELP!! 2 Trig Problems

    1. cos4(theta)

    2. cos 5pi/12







    Need Help!! Thanks!!
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  2. #2
    Master Of Puppets
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    What exactly do you have to do with Q1? The way you have left it does not suggest to either, prove, simplify or solve anything?

    In Q2 apply the following formula

     cos(\tfrac{\theta}{2}) = \pm\sqrt{\frac{1-cos(\theta)}{2}}

    my solution is
     cos(\tfrac{5\pi}{12}) = \pm\sqrt{\frac{1-\frac{\sqrt{3}}{2}}{2}}
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