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Math Help - Trig Solutions

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    Trig Solutions

    Find ALL solutions to cos(x) = 17/20 in the interval [, ].

    How would you go about finding the solutions between this range? Cheers.
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    Quote Originally Posted by Haris View Post
    Find ALL solutions to cos(x) = 17/20 in the interval [, ].

    How would you go about finding the solutions between this range? Cheers.
    since \frac{17}{20} > 0 , solutions will be in quads I and IV

    quad I solutions ...

    \arccos\left(\frac{17}{20}\right) - 2\pi

    \arccos\left(\frac{17}{20}\right) - 4\pi

    quad IV solutions ...

    -\arccos\left(\frac{17}{20}\right) - 2\pi

    -\arccos\left(\frac{17}{20}\right) - 4\pi
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