Let `f: X->X` be such that `f(f(x)) = x` for all `x in X and X sube R`, then

Let F : X to X be such that f(f(x))=x for all x in X and X sube R , then

Let f be a function from a set X to X, such that (f(f(x)) = x, for all x in X , then

Let f be a function from a set X to X, such that (f(f(x)) = x, for all x in X , then

Let f:R to R such that f(x+y)+f(x-y)=2f(x)f(y) for all x,y in R . Then,

Let f:R to R such that f(x+y)+f(x-y)=2f(x)f(y) for all x,y in R . Then,

Let f: Rrarr R be defined as f(x) = 2x for all x in N , then f is

Let f:(0,oo)->R be a differentiable function such that f'(x)=2-f(x)/x for all x in (0,oo) and f(1) =1 , then

Let f : R to R be such that, f(2x-1)=f(x) for all x in R . If f is continuous at x = 1 and f(1)=1 then-

Let f:(0,oo)->R be a differentiable function such that f'(x)=2-f(x)/x for all x in (0,oo) and f(1)=1 , then