sinx=m-1分之2
则:
-1≤2/(m-1)≤1
(1) 2/(m-1)≥-1
2/(m-1)+1≥0
(2+m-1)/(m-1)≥0
(m+1)/(m-1)≥0
m>1或m≤-1
(2) 2/(m-1)≤1
2/(m-1)-1≤0
(2-m+1)/(m-1)≤0
(m-3)/(m-1)≥0
m≥3或m
sinx=m-1分之2
则:
-1≤2/(m-1)≤1
(1) 2/(m-1)≥-1
2/(m-1)+1≥0
(2+m-1)/(m-1)≥0
(m+1)/(m-1)≥0
m>1或m≤-1
(2) 2/(m-1)≤1
2/(m-1)-1≤0
(2-m+1)/(m-1)≤0
(m-3)/(m-1)≥0
m≥3或m