A \( \frac{1}{16}(8x + \sin 8x) \)
B \( \frac{1}{8}(8x - \sin 8x) + c \)
C \( \frac{1}{16}(8x - \sin 8x) + c \)
D \( \frac{1}{16}(8x - \sin 8x) + c \)
Correct Answer: Option C
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