Prove that f\'(a+b)=f\'(a)+f\'(b) when f(x)=x square and when f(x)=x cube

Prove that f\'(a+b)=f\'(a)+f\'(b) when f(x)=x square and when f(x)=x c

1.	Prove that f\'(a+b)=f\'(a)+f\'(b) when f(x)=x square and when f(x)=x cube
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