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f (g (x)) = x/ x+1
2 g(x) + 1 = x / x+1
2g(x) = x / x+1 - 1
= x- (x+1) / x+1
= -1 / x+1
g(x) = -1 / 2x+2
invers g(x)
y = -1/ 2x+2
2xy+2y = -1
2xy = -2y-1
x = -2y-1 / 2y
g'(x) = - 2x+1 / 2x ---> (e)