*15. (a) Let f be a function such at |f(x)l s x2 for all x. Prove that f is IS differentiable at 0. (If you have done Problem 14 you should be able to do this.) (b) This result can be generalized if x2 is replaced by lg(x)I, where g has what property?

Q: find f(2021) if function f satisfies following the function f(1)=1 and f(x+y)= f(x)+f(y)

A: we have given f(x+y) =f(x) +f(y) and f(1) =1. We have to find f(2021)

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