Question 512069: Find the exact value of this expression:
cos ( tan^1 ( 1/4 ) )
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Find the exact value of this expression:
cos ( tan^-1 ( 1/4 ) )
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Since tan = 1/4, y = 1 and x = 4
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Then r = sqrt[1^2+4^2] = sqrt(17)
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So, cos = x/r = 4/sqrt(17)
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Cheers,
Stan H.
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