21. The trigonometric identity 1 1 - cos a cos B = cos(a + b) + cos(a - b) 2 is useful. S cos 18x cos 10x dx = 22. The trigonometric identity 1 1 sin a cos ẞ = ½-½ sin(a + B) + ½ sin(a - b) is useful. js sin 47x cos 21x dx =

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