Jawabanmu

2014-04-28T13:45:31+07:00
sin ( 3x ) dx . u = 3x, maka du=3dx, dx=1/3du
f baca integral y
=f 
sin ( 3x ) dx 
=f sin u.1/3du
=f 1/3 sin u du
=1/3 -cos u+c
=-1/3 cos 3x+c