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Function g(x)=2f((x^(2))/(2))+f(6-x^(2))...

Function `g(x)=2f((x^(2))/(2))+f(6-x^(2))` for all `xepsilonR` is decreasing and `f^(``)(x)gt0` for all `xepsilonR` then complete set of values of x is

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