Asked by TayB
simplify the expression.
cos(2 tan^-1 x)
cos(2 tan^-1 x)
Answers
Answered by
Steve
if tanθ = x, then cosθ = 1/√(1+x^2)
cos2θ = 2cos^2θ - 1 = 2/(1+x^2)-1 = (1-x^2)/(1+x^2)
cos2θ = 2cos^2θ - 1 = 2/(1+x^2)-1 = (1-x^2)/(1+x^2)
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