(Solved):   Use an Addition or Subtraction Formula to simplify the equation. \[ \sin (\theta) \cos (3 ...

 

Use an Addition or Subtraction Formula to simplify the equation. \[ \sin (\theta) \cos (3 \theta)+\cos (\theta) \sin (3 \theta)=0 \] Find all solutions in the interval \( [0,2 \pi) \). (Enter your answers as a comma-separated list.) \( \theta= \)