sina-sinb=2sin((a-b)/2)*cos((a+b)2)
2sin3xcos4x=2cos4x
sin3x=1
3x=pi/2+2pi*n
x=pi/6+(2pi*n)/3
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sina-sinb=2sin((a-b)/2)*cos((a+b)2)
2sin3xcos4x=2cos4x
sin3x=1
3x=pi/2+2pi*n
x=pi/6+(2pi*n)/3