兀、2√2 2 M=fo) ,m=f()= T T g TC b-a 244 2兀 SIn 2、2兀 ≤2d≤ 兀4 4 I sinx 2 < 2 2, 2 2 ) 4 (  =  M = f , 2 ) 2 (  =  m = f , 2 4 4  =  −   b − a = , 4 sin 2 2 4 2 2 4             dx x x . 2 sin 2 2 1 2 4       dx x x