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If f(x) = tan^-1x,g(x) = tan^-1((1+x)/(1...

If `f(x) = tan^-1x,g(x) = tan^-1((1+x)/(1-x))` fo |x| < 1, show that f' (x) = g' (x) and g(x) - f(x) = pi/4`

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