Posted by Mia on Thursday, January 5, 2012 at 12:06am.
just plug in the values for f and g
f(g) = 4 - g^3 = 4 - cbrt(4-x)^3 = 4 - (4-x) = x
g(f) = cbrt(4-f) = cbrt(4 - (4-x^3)) = cbrt(4-4+x^3) = cbrt(x^3) = x
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