SOLUTION: cos [Arcsin (-1/4) ]

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Question 176102: cos [Arcsin (-1/4) ]
Answer by stanbon(75887) About Me  (Show Source):
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cos [Arcsin (-1/4) ]
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Since the sin is -1/4, y=-1 and r = 4
Therefore x = sqrt(r^2-y^2) = sqrt(16-1) = sqrt(15)
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Then cos = x/r = sqrt(15)/4
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Cheers,
Stan H.