Increasing Decreasing function

[RichaS]

Please help

[Abhitesh]

|f(y)-f(x)| <= |x-y|^3
=>|f(y)-f(x)|/|y-x| <= |x-y|^2

Let y=x+h Lim h->0
=>|df/dx| <= h^2 = 0
=> The function is constant.