упростите выражение sin 3x*cos 3x
sin(3x)*cos(3x)=(sin(2*3x))/2=(sin(6x))/2
2*½*sin 3x*cos 3x=½*sin6x
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sin(3x)*cos(3x)=(sin(2*3x))/2=(sin(6x))/2
2*½*sin 3x*cos 3x=½*sin6x