Given that the function FX of the domain of definition in R decreases monotonically in the interval (from negative infinity to 5), for any real number T, f (5 + T) = f (5-T) f-1

Given that the function FX of the domain of definition in R decreases monotonically in the interval (from negative infinity to 5), for any real number T, f (5 + T) = f (5-T) f-1

When t = 6, f (5-6) = f (5 + 6)