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Math Help - Maths help

  1. #1
    Newbie
    Joined
    Nov 2009
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    Maths help

    Hello

    stuck on a few questions

    2 cos squared x = 1/2

    3 cos 2x + cos x +1 = 0

    2 cos 2x - sinx = 0


    thanks in advance for any help

    please show anyworking. :P
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  2. #2
    MHF Contributor
    Joined
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    Quote Originally Posted by Wallothet View Post
    Hello

    stuck on a few questions

    2 cos squared x = 1/2

    3 cos 2x + cos x +1 = 0

    2 cos 2x - sinx = 0


    thanks in advance for any help

    please show anyworking. :P
    Hi and welcome to MHF. Please post one question per thread.

    I'll start with #1. 2\cos^2(x)=\frac{1}{2}

    Divide by 2 and take the square root of both sides to simplify. What do you get and any ideas on how to solve?
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