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Find the domain of the composite functino g(f(x)). F(x)=3x, g(y)= 1/y G(f(x))= 1/3x
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domain of a fraction is valid anywhere where the denominator is not zero so the numbers that would make this fraction zero is when x= 0 therefore the function's domain is everywhere but zero in other words \[(-\infty,0)\cup(0,\infty)\]or all reals but zero
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