putting x and y both as 0 i get f(0) as 0........{f(0)=2f(0)}

so i have putting 0 in the origional eqn. that

f(yⁿ) =[f(y)]ⁿ ........

now this can happen in a special case of f(y)=y.............or say f(x)=x........

thus i have my f(5)=5............----------------1)

and as f(x)=x .........f'(x)=1.........--------------2)

so we have f(5) + f'(5) = 6 from 1) and 2)..............d)

this might not be the traditional mtd........this is the mtd i will use..............