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Algebra II

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Find cos theta if sin theta = 3/5 and 90 degrees<theta<180 degrees.

Is the answer -sqrt34/5?

Appreciate you checking my anwers.

  • Algebra II -

    cos is - in second quadrant
    this is a 3,4,5 right triangle but anyway
    3^2 + x^2 = 25
    x^2 = 16
    x = 4 but actually -4 because in quadrant 2
    cos t = -4/5

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