Trig

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Solve:cos^2x=1 for 0 < x is less than or equal to 2pi

  • Trig -

    cos^2 x = 1
    take square root of both sides
    +- cos x = 1

    cos x = 1
    cos x = -1

    for what angle value is cos = 1 and cos = -1 ?

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