Question: 13 Evaluate sin 5x cos 4x dx a c co cos x cos 9x C 18 cosx co 18 cos 9x C b d cos


13 Evaluate sin 5x cos 4x dx a c co cos x cos 9x C 18 cosx co 18 cos 9x C b d cos 5x c cos 4x C cosx to 1 18 cos 9x C
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