Question 162211
( f of g )(x) and (g of f)(x) 

f(x)= 2^x , g(x)= 5^x
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f[g(x)] = f[5^x]= 2^[5^x] 
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g[f(x)] = g[2^x} = 5^[2^x]
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Cheers,
Stan H.