9. 令 $f(x) = \begin{cases} 2x^5 + 4\alpha, & x \leq 1 \\ \beta x^2 - 7, & x > 1 \end{cases}$;若 f(x) 為到處可微分的函數,則 $\alpha$、$\beta$ 值應為何?
(A) $\alpha = 1, \beta = 13$
(B) $\alpha = -1, \beta = 5$
(C) $\alpha = -2, \beta = 1$
(D) $\alpha = 2, \beta = 17$

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