<PRE><B>Question 831646</B>
find sin theta if cos theta=1/2 and theta terminates in quadrant IV
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In QIV x is positive and y is negative
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Since cos = x/r, x = 1 and r = 2
Then y = -sqrt[2^2-1^2] = -sqrt(5)
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Ans: sin(t) = y/r = -sqrt(5)/2
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Cheers,
Stan H.
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