8. 若 \( f(x) = \int h(x)dx \), \( g(x) = \int h(x)dx \), 且 \( f(x)+g(x)=10 \), 則下列何者為正確?
(A) \( h(x) = \sin x - \cos x \)
(B) \( h(x) = 5x \)
(C) \( h(x) = 0 \)
(D) \( h(x) = e^{-x} \)

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