The principal value of sin-1 2x lies in the interval
1
\(\left( { - \frac{\pi }{2},\frac{\pi }{2}} \right)\)
2
\(\left[ { - \frac{\pi }{2},\frac{\pi }{2}} \right]\)
3
\(\left[ {0,\frac{\pi }{2}} \right]\)
4
\(\left[ {\frac{{ - \pi }}{6},\frac{\pi }{6}} \right]\)