青岛版数学八下用计算器求锐角三角比ppt优质课市名师优质课比赛一等奖市公开课获奖课件.pptx

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,9.3 用计算器求锐角三角比(1),第9章 解直角三角形,第1页,温故知新,特殊角三角函数,角,三角比,30,45,60,sin,cos,tan,1,2,1,2,2,2,3,3,2,1,2,3,2,2,3,3,第2页,第3页,例题讲解,第4页,例题讲解,第5页,0.9659,0.8121,1.5926,0.9686,0.8071,0.5012,0.9999,3.1022,第6页,0.0175,0.9999,0.1736,0.9848,0.3420,0.9397,0.5,0.8660,0.6428,0.7660,0.7071,0.7071,0.7660,0.6428,0.8660,0.5,0.3420,0.9397,0.1736,0.9848,0.0175,0.9999,当锐角,逐步增大时，它正弦值逐步增大，它余弦值逐步减小.,当0,90时，0sin,1,0cos,1,第7页,1.,2.当锐角,逐步增大时，它正弦值逐步增大，它余弦值逐步减小.,3.当0,90时，0sin,1,0cos,1,课堂小结,第8页,作业,必做题:书本,P,72,A,组,1题,选做题:书本,P,73,B,组,1题,第9页,同学们,再见,!,第10页,