functional equation

Which books do you read ut?

@vinay
and y did u ask him tht?

These types of questions never came in IIT according to me.And the theory involved is not in JEE(my approximation).

Akhil,I said these kind of questions never came.But I did not say that these will never come.

this may be useful,

all functions of the form
f(x) =ax+bcx+d where a+d = 0

yeild f(f(x)) = x.

@joydoot : please show the process for arriving at that solⁿ.

are commuting polynomials in syllabus [6]

COMMUTING POLYNOMIALS.?????

Kunl,do you remember the question that submitted few months before?
f(g(x))=g(f(x))??????