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Click to edit Master text styles,Second level,Third level,Fourth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Click to edit Master title style,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,*,*,第二十八章 直角三角形的边角关系,28.9,三角函数值的变化规律,经典例题,求满足下列条件的锐角,A,:,(,1,),sinAcosA,;,(,3,),sinA=cosA.,巩固练习,1.,求满足下列条件的锐角,A,:,(,1,),tanAcotA,;,(,3,),tanA=cotA.,提高练习,2.,若,为锐角,求证:,。,提高练习,3.,设,为锐角,试判断,。,拓展练习,4.,若,0,30,,且,sin,=,km,+0.5,(,k,为常数且,k,0,,,求,m,的取值范围,.,回味无穷,课后作业,优等生数学,九年级,P144 T1,、,T2,、,T3,、,T4,写在作业本上,.,预习,优等生数学,九年级的第,56,、,57,节,.,
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