Question 829513
 Find the exact value of cos(arctan11/60) 
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Let "t" = arctan(11/60)
Then tan(t) = 11/60
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Since tan(t) = y/x, y = 11 and x = 60
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Then r = sqrt[11^2+60^2] = sqrt(3721) = 61
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Therefore: cos(t) = x/r = 60/61
So cos[arctan(11/60)] = 60/61

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Cheers,
Stan H.
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