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March 25, 2017

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if cos 2 theta = -(1/3) and theta is in Quadrant 2, find sin theta, cos theta, tan theta, and draw triangle theta

  • math (trig) - ,

    -1/3 = cos 2theta = 1 - 2 sin^2 theta
    2 sin^2 theta = 4/3
    sin theta = sqrt(2/3)
    cos theta = sqrt(1 - 2/3) = -sqrt(1/3)
    (minus since theta must be in quadrant 2)

    tan theta = -sqrt2

    theta = 125.26 degrees

    You draw the figure

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