SOLUTION: Find the trigonometric function value of angle(delta). cos(delta)=8/9, with (delta) in quadrant IV. Find sin(delta)

Algebra ->  Trigonometry-basics -> SOLUTION: Find the trigonometric function value of angle(delta). cos(delta)=8/9, with (delta) in quadrant IV. Find sin(delta)      Log On


   

Question 834108: Find the trigonometric function value of angle(delta).
cos(delta)=8/9, with (delta) in quadrant IV. Find sin(delta)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
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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