Evaluate the integral: f sin 7x cos 2x dx. A) sin 5x + sin 9x + c. 2 B) cos 5x +co cos 9x + c. 10 C) cos 5x-18 10 cos 9x + c. | 1 1 D) cos 5x + 10 cos 9x + c. 18 - E) cos 5x 10 cos 9x + c. 18 -

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