A function f, defined for all non-zero real numbers x, satisfies:
f(x) + 4f(1/x) = 3x.
[1] Find all values of x for which f(x)=f(1/x);
[2] Find all values of x for which f(x)=f(-x).
Just math is defining the function with the post of year 2010 with the definition of the non zero real number that satisfies. The solution is provided here with the
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