`f(x+1/y)+f(x-1/y)=2f(x)*f(1/y)` for all x `y in R-{0} and f(0)=1/2`, then `f(4)` is

abs(f(x)-f(y))le(x-y)^2 forall x,y in R and f(0)=1 then

Let f(x+1/y) +f(x-1/y) =2f(x) f(1/y) AA x, y in R , y!=0 and f(0)=0 then the value of f(1) +f(2)=

Let f(x+1/y) +f(x-1/y) =2f(x) f(1/y) AA x, y in R , y!=0 and f(0)=0 then the value of f(1) +f(2)=

Let f(x+1/y) +f(x-1/y) =2f(x) f(1/y) AA x, y in R , y!=0 and f(0)=0 then the value of f(1) +f(2)=

Let f(x+1/y)+f(x-1/y)=2 f(x)f(1/y)AAxy in R, y ne 0 and f(0) = 0 then the value of f(1) + f(2) = a) -1 b)0 c)1 d)none of these

Let f(x+(1)/(y))+f(x-(1)/(y))=2f(x)f((1)/(y))AA x,y in R,y!=0 and f(0)=0 then the value of f(1)+f(2)=

If 2f(x)=f(x y)+f(x/y) for all positive values of x and y,f(1)=0 and f'(1)=1, then f(e) is.

If 2f(x)=f(x y)+f(x/y) for all positive values of x and y,f(1)=0 and f'(1)=1, then f(e) is.

If 2f(x)=f(x y)+f(x/y) for all positive values of x and y,f(1)=0 and f'(1)=1, then f(e) is.

If f:R rarr R satisfies f(x+y)=f(x)+f(y), for all x,y in R and f(1)=2 then sum_(r=1)^(7)f(1)