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Math Help - Trig

  1. #1
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    Trig

    Determine the angle(s) for the following in the interval from 0-360 degrees. costheta=-0.363.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by rmweeks View Post
    Determine the angle(s) for the following in the interval from 0-360 degrees. costheta=-0.363.
    If \cos \theta = -0.363

    \Rightarrow \theta = \cos^{-1}(-0.363)

    \Rightarrow \theta \approx 111.285^{\circ}

    this angle is in the second quadrant. another is in the third, using reference angles, we find the other angle to be \approx 248.715

    i rounded off a lot, so these answers might not be as accurate as you want them. try to understand what i did and redo the problem with more decimal places if you like
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