Which of the following is true? J sin(3x)sin(4x)dx = cos(x) – cos(7x) dx 2 ® Jsin(3x)cos(4x)dx = [ sin(7x)– sin(x) dx 2 © Jsin(4x)cos(3x)dx= [ cos(x) + cos(7x) 2 O Jcos(3x)cos(4x)dx = [ cos(x) + cos(7x) D

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