" If "f(x+y)=f(x)" ."f(y),AA x&y in N" and "f(1)=2," then the value of "sum^(10)f(n)" is "

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

If (x+f(y))=f(x)+y AA x,y in R and f(0)=1 then find the value of f(7).

If f:RR to RR satisfies f (x+y) =f (x) + f (y) for all x,y in RR and f(1) =7, then the value of sum _(r=1) ^(n) f(r) is-

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)-xy-1 AA x, y in R and f(1)=1 then the number of solution of f(n)=n, n in N is

lf f: R rarr R satisfies, f(x + y) = f(x) + f(y), AA x, y in R and f(1) = 4, then sum_(r=1)^n f(r) is

Let f(x+y)=f(x)f(y)AA x, in IR, f(6)=5 and f'(0)=1 . Then the value of f' (6) is

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