Question: Question (22) Use the following three identities to evaluate sin 14x cos 5x dx. sin sx cos tx = , [ sin (s + t)x

Question (22) Use the following three identities to evaluate sin 14x

cos 5x dx. sin sx cos tx = , [ sin (s

Question (22) Use the following three identities to evaluate sin 14x cos 5x dx. sin sx cos tx = , [ sin (s + t)x + sin (s - t)x] sin sx sin tx = [ cos (s + 1)x - cos (s - t)x] cos sx cos tx = = [ cos (s + ()x + cos (s -t)x] sin 14x cos 5x dx = Question (23) Use the following identity to evaluate the given integral, shown below. sin mx sin nx = = [cos (m - n)x - cos (m + n)x] sin 6x sin 3x dx sin 6x sin 3x dx =_

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