Question 744248
Find solutions in radians for 0 less then or equal to x less then 2pi: 
sin^2(3x)-3sin(3x)-4=0
sin((3x)-4)(sin(3x)+1)=0
..
sin((3x)-4)=0
sin(3x)=4 (reject,(-1 ≤ sin(3x) ≤ 1))
..
sin(3x)+1=0
sin(3x)=-1
3x=3π/2
x=3π/6=π/2