SOLUTION: Simplify the expression. Cos(2arctan(x)) arctan is just the inverse of tan Example tan^-1
You can put this solution on YOUR website! Simplify the expression. Cos(2arctan(x)) Use the double-angle formula cos(2w) = 1-2sin^2(w)In your problem w = arctan(x) If the tangent of w is x/1 then the sin(w) = x/sqrt(x^2+1)...