If `f(x). f(y)=f(x)+f(y)+f(xy)- 2 AA x,y in R` and if `f(x)` is not a constant function, the value of f(1) is equal to

If (x).f(y)=f(x)+f(y)+f(xy)-2AA x,y in R and if f(x) is not a constant function,the value of f(1) is equal to

If f(x+y) =f(xy) AA x, y in R and if f(2008) = 2008 then find the value of f(2009).

If f is polynomial function satisfying 2+f(x)f(y)=f(x)+f(y)+f(xy)AA x,y in R and if f(2)=5, then find the value of f(f(2))

If f(x+y)+f(x-y)=2f(x).f(y) AA x,y in R . f(0)ne0 , find if f(x) is even or odd function.

Let f(x+y)+f(x-y)=2f(x)f(y) AA x,y in R and f(0)=k , then

Let f(x+y)+f(x-y)=2f(x)f(y)AA x,y in R and f(0)=k, then

If f(x+y) = f(x) + f(y) + |x|y+xy^(2),AA x, y in R and f'(0) = 0 , then

If f(x+y) = f(x) + f(y) + |x|y+xy^(2),AA x, y in R and f'(0) = 0 , then

If f(x+y) = f(x) + f(y) + |x|y+xy^(2),AA x, y in R and f'(0) = 0 , then