If `f(x + ay, x-ay) = axy` then `f(x, y)` is equal to

If f (x+ y) = f(x) , f(y) , f(3) = 3 , f'(0) = 11 . Then f'(3) is equal to

A mapping f is defined : f:(x,y)rarr (x+y,x-y) then f(-1,-2) is equal to

If f(x)=(2^x+2^-x)/2 , then f(x+y) f(x-y) is equal to:

y = f(x) , Where f satisfies the relation f(x + y) = 2f(x) + xf(y) + ysqrt(f(x)) AA x, y in R and f'(0) = 0 . Then f(6) is equal to ………

A function f:RtoR is such that f(x+y)=f(x).f(y) for all x.y inR and f(x)ne0 for all x inR . If f'(0)=2 then f'(x) is equal to