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Math Help - stationary points

  1. #1
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    stationary points

    hi

    i have two values of x calculated from previous question

    and

    i put them into
    to find stationary points for the function of g(x)

    cos and cos both give me .

    put and into and come up with nice answer e^1/3.

    but as i have two values of x i must have two points but i must be wrong as they are at the same coordinate

    any help would be great
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  2. #2
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    Quote Originally Posted by smartcar29 View Post

    cos and cos both give me .
    \cos\left(\frac{\pi}{6}\right) = \frac{\sqrt{3}}{2}

    \cos\left(\frac{5\pi}{6}\right) \neq \frac{\sqrt{3}}{2}

    Which quadrant in the unit circle does \frac{5\pi}{6} live?

    What do you know about \cos(x) there?
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  3. #3
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    ah it is clear to me now is it \frac{-\sqrt{3}}{2} many thanks to you sir. have a good day down under

    many thanks
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