SOLUTION: i need help on how to do this step by step find cos(acrtan(9/5))?

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Question 753432: i need help on how to do this step by step
find cos(acrtan(9/5))?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
i need help on how to do this step by step
find cos(acrtan(9/5))?
opposite side=9
adjacent side=5
hypotenuse=√(9^2+5^2)=√81+25)=√106
cos(acrtan(9/5)=5/√106