[منال نينة]

الحل
1) f'(x)=3(-sin(3x-2)
f'(x)=-3sin(3x-2)
2) f'(x)=3(cos(3x-2)
f'(x)=3cos(3x-2)
3) f'(x)=cos(x)*cos(x)+(-sin(x)*sin(x)
f'(x)=cos(x)2-sin(x)2
4) f'(x)=cos(x-2pi)*cos(x+pi)-sin(x+pi)*sin(x-2pi)