<PRE><B>Question 753010</B>
find cos theta when sin theta equals 60 divided by 61 and theta is in the second quadrant
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sin = y/r = 60/61 so y = 60 and r = 61
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In QII y is positive and x is negative
x = -sqrt[61^2-60^2] = -sqrt[121] = -11
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cos(theta) = x/r = -11/61
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Cheers,
Stan H.
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