SOLUTION: cos(tan^-1 x)

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Question 867348: cos(tan^-1 x)

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
cos(tan^-1(x))
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Let tan^-1(x) = t
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Since tan(t) = opp/adj = x/1, hypo = sqrt(x^2+1)
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Then cos(t) = adj/hypo = 1/sqrt(x^2+1)
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Cheers,
Stan H.
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