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g(x) = (2x-1)/(x+2)
(fog)(3) = f(g(3)) ; g(3) = (2(3)-1)/((3)+2)
g(3) = (5)/(5)
g(3) = 1
(fog)(3) = f(1)
= 3x² - 1
= 3(1²) - 1
= 3 - 1
= 2