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(gof)(x)=g(x-1/x)=4x-1/x
lalu inverskan (gof)(x)
misalkan: y=4x-1/x
=> 4x-1=xy
=> xy-4x=-1
=>x(y-4)=-1
=>x=-1/y-4
jadi, (gof)^{-1} [/tex] (x)=-1/x-4