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g(x)= 2/(3-x)
fog(x) = f { g(x)} = f {2/(3-x)}
= 1/ {(2/(3-x)) +1 }
= (3-x)/ (2 + 3 - x)
= (3 - x)/ (5 - x)
= (x -3)/(x - 5)
(fog)⁻¹ = (-5x + 3)/(-x + 1) = (5x - 3)/(x - 1)