Which of the following is true? @ Jcos(3x)cos(4x)dx= [ cos(x) + cos(7x) 2 BAll of the above © Jsin(3x)cos(4x)dx = [ sin(7x)– sin(x) 2 J sin(4x)cos(3x)dx= [cos(x)+ cos(7x) 2 s( - cos(7») dx cos(x) – cos(7x) ® Jsin(3x)sin(4x)dx = [

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