<PRE><B>Question 834108</B>
 Find the trigonometric function value of angle(delta). 
cos(delta)=8/9, with (delta) in quadrant IV. Find sin(delta)
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If delta is in QIV, x is positive and y is negative.
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cos = x/r
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Since cos = 8/9, x = 8 and r = 9
Then y = -sqrt[9^2-8^2] = -sqrt(17)
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sin(delta) = y/r = -sqrt(17)/9
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Cheers,
Stan H.
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