Question 979165
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*[tex \Large f] operation *[tex \Large g] simply means to apply the operation to the definitions of *[tex \Large f] and *[tex \Large g].


*[tex \Large f(x)] is the definition of the function for all values in the domain of the function.  *[tex \Large f(2)] is the value of the function when *[tex \Large x\ =\ 2].  *[tex \Large f(a)] is the value of the function at *[tex \Large a] assuming *[tex \Large a] is in the domain of the function.  *[tex \Large f(\pi r^2)] is the value of the function at *[tex \Large \pi r^2].  *[tex \Large f(\text{the Artist Formerly Known as Prince})] is the value of the function at *[tex \Large \text{the Artist Formerly Known as Prince}], again presuming that *[tex \Large \text{the Artist Formerly Known as Prince}] is in the domain of the function.


This is really a very simple concept, which means that if you don't get it, you are over-thinking it.  Go back and read the definition of the mathematical concept "function", and don't put anything more into it than what is in that definition.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \