If `sin^(2)x` - (m - 3)sin x + m=0 "has real roots then which of the following is/are correct"
A. Number of roots of equation in `[-2pi,2pi]is 2 for m=1`
B. Number of roots of equation in `[-2pi,2pi]is 1 for m=9`
C. Roots are real for `m le 1`
D. If sin x =t then `t^(2)-(m-3)t+m=0` can not have both roots in [-1,1]`
