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Math Help - Hyperbolic function?

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    Hyperbolic function?

    Find all solutions of cos x = 1/2 in the interval [-3pi,3pi].

    Could someone explain how to solve this? Cheers.
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    Quote Originally Posted by Haris View Post
    Find all solutions of cos x = 1/2 in the interval [-3pi,3pi].

    Could someone explain how to solve this? Cheers.
    First I would graph the function on the interval [-3\pi,3\pi] to find the number of times \cos x = \frac{1}{2}. From th symmetry of the cosine curve and knowing that one answer is  x = \frac{\pi}{3} should get you the rest.
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