1 Answers
Lokesh Verma
·2009-07-29 00:11:20
the range of f(x) is integers...
also, it is only non negetive integers..
when h is +ve and very small f(-1+h) = f(1-h) = 0
when h is -ve and very small f(-1-h) = f(1+h) = 1
This means h is not a continous function at h=-1
SO the derivative does not exit!