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Precalc with Trig

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What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0

  • Precalc with Trig - ,

    cos^2 Ø - sin^2 Ø = 6
    cos 2Ø = 6

    no solution, the cosine of anything cannot be greater than 1
    do you have a typo?

  • Precalc with Trig - ,

    No, I don't just my professor trying to trick us, thanks for the help!

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