SOLUTION: simplify the expression, cos[arctan(x/4)]

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Question 946941: simplify the expression, cos[arctan(x/4)]
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
simplify the expression, cos[arctan(x/4)]
tan%28theta%29=x%2F4 (-π/2,π/2)
hypotenuse=√(x^2+4^2)=√(x^2+16)
cos[arctan(x/4)]=4/√(x^2+16)