Abstract :Using the methods of literature and logical analysis ,the study of the cultivation of humanistic literacy among current physi ⁃ cal education teacher-training students takes the construction of a "new liberal arts"and physical education culture as the starting point.Conclusion:The paranoid...
4、tan xsin'x2tan x解析:因为tan(π十x)=3,所以tanx=3,tan2x-sinx=1-tanx一sinx+cos2x-1-tan2z1十m。4g=器tan'x8解析:设优弧BC所在圆的圆心为O,半径为R,连接OA,OB,OC,如图所示.易知“水”的水平宽度为0A+R,竖直高度为2R,由题意知O波-号解得OA-号R因为ABaw8-,co8∠BA0=√1-sin'∠BA...