Производная функции sin³x cos 3x

1)to going. 2)to washing. 3)not to going 3.1)to costing. 4)not to knowing. 5)to spending. 6)to getting. 7)to doing. 7.1) to cameing

3sin^2 (x)*cos(x)*cos(3x)-3cos(3x)*sin(3x)*sin^3 (x)