Ответ
((Sin(x)+sin(3*x))/(cos(x)+co+coss(3*x(1)))*(4*x))=((2*Sin(2*x)*cos(x))/2*cos(2*x)*cos(x)))*2*(cos(2*x)=sin(4*x);
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Ответ
((Sin(x)+sin(3*x))/(cos(x)+co+coss(3*x(1)))*(4*x))=((2*Sin(2*x)*cos(x))/2*cos(2*x)*cos(x)))*2*(cos(2*x)=sin(4*x);