Which of the following is true? O Scos(3x)cos(4x)dx= [ r cos(x) + cos(7x) dx B Jsin(3x)cos(4x)dx= [ Sin(7x) – sin(x) dx 2 © Jsin(4x)cos(3x)dx = [ ° cos(x) + cos(7x) 2 All of the above *cos(x)– cos(7x) ® Ssin(3x)sin(4x)dx = [ dx 2

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