differentiation

Question: Let $f\,(x)=1+2{{x}^{2}}+{{2}^{2}}{{x}^{4}}+.....+{{2}^{10}}{{x}^{20}}$ , then $f(x)$ has



1) More than one minimum
2) Exactly one minimum
3) At least one maximum
4) None of these
Solution: Explanation: No Explanation
Maxima and Minima

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