differentiation

Question: Let $f(x)$ be a polynomial function of the second degree. If $f(1) = f( - 1)$ and ${a_1},{a_2},{a_3}$ are in A.P. then $f'({a_1})$, $f'({a_2})$, $f'({a_3})$ are in



1) A.P
2) G.P.
3) H.P
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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