Please I need help.
f: R -> R , 3f(x) +f^3(x) =x, for every x∈R
if f(R) = R show that f is continuous in R.
Show that f is derived in R.
I dont know how to prove these, I found that
f(0) = 0 and did the lim x->0 f(x) = f(0) but I dont know if im right. Help please
>>328404
Is
[eqn]f^3(x) = f(f(f(x))) [/eqn]
or
[eqn] f^3(x) = (f(x))^3 [/eqn]
here?