18. Evaluate fe³x cos 8x dx e3x a. [8sin 8x 3 cos 8x] + C 3x b. [8sin 8x + 3 cos 8x] + C 73 C. d. [8e³xsin 8x + 3 cos 8x] + C e3x -[sin 8x + cos 8x] + C

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