The function \( f(x)=2+4 x^{2}+6 x^{4}+8 x^{6} \) has (A) only one ...

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The function \( f(x)=2+4 x^{2}+6 x^{4}+8 x^{6} \) has
(A) only one maxima
(B) only one minima
\( \mathrm{P} \)
(C) no maxima and minima
(D) many maxima and minima
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