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(f^-1 o g^-1)(x) = f^-1(x/x+1)=2x/x+1
lalu inverskan
(f^-1 o g^-1)^-1 (x) = x/2-x
(f^-1 o g^-1)^-1 (x) = (gof)(x)
jadinya: (gof)(x) = x/2-x