Answer:
Step-by-step explanation:
2sin(3x)=-1
3x=invsin(-1/2)
what angle gives 1/2, 30 deg or pi/6
So formal solution is pi/6 but there is another on the other side, at 7pi/6
The 2 basic solutions are: 11pi/18 and 7pi/18
So the expressions are
(11pi/18+2npi/3)
and (7pi/18+2npi/3)