Let u=sin(x).Substitute u for all occurrences ofsin(x).
3u2−7u+2
3u2−6u−1u+2
3u(u−2)−1(u−2)
(u−2)(3u−1)
Replace all occurrences of u with sin(x).
(sin(x)−2)(3sin(x)−1)
Replace the leftside with the factored expression.
(sin(x)−2)(3sin(x)−1)=0
If any individual factor on the left side of the equation is equal to 0,the entire expression will be equal to 0.
sin(x)−2=0 or 3sin(x)−1=0
∴sin(x)=2 or sin(x)=13