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need to denote function found in line "7" as f(x):=1/4x^3......or g(x):=1/4x^3.... immediately after line '6" when using substitution command. please help. thanks
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The same question 
need to denote function found in line "7" as f(x):=1/4x^3......or g(x):=1/4x^3.... immediately after line '6" when using substitution command. please help. thanks
To name it use e.g.
f(x):=Substitute[.....]
By the way you cannot name a function using the same name of one of the functions you used for substitution...
As you can see GeoGebra names it e(x), which is the first letter available in alphabetical order.
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