16. 求 \(\int_{-\pi/4}^{\pi/4} (x+x^3+e^x)dx = ?\)
(A) \(-\frac{\pi^2}{8} + e^{\pi/4} - e^{-\pi/4}\)
(B) \(e^{\pi/4} - e^{-\pi/4}\)
(C) \(\frac{\pi^2}{8} + e^{\pi/4} - e^{-\pi/4}\)
(D) \(\frac{3\pi^2}{8} + e^{\pi/4} - e^{-\pi/4}\)

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