find at least on real function which is defined by : f( k * x) = f (x) for all x Real and k real

- Obviously all constants satisfies the equation above , but you can say more if
**f** is continue at **x=0** , then **f** is a constant function
- a non trivial example of a solution of equation above could be : x → sin( 2π * ln(x) ) with k = e, you can notice that this function is not continue at x = 0

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