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,*,1,.,用计算器求,sin 40,,,cos40,,,tan40,的值,.,(精确到,0.0001,),sin 40=0.6428,cos40=0.7660,tan40=0.8391,2,.,用计算器求下列三角函数值:(精确到,0.0001,),(,1,),sin 72,,,cos36,,,tan55,;,(,2,),sin 72,25,,,cos2913,44,,,tan88,21,.,解,:,(,1,),sin 72=0.9511,,,cos36=0.8090,,,tan55=1.4281,;,(,2,),sin 72,25,=0.1226,,,cos2913,44=0.8727,,,tan88,21,=34.7151,.,3,.,用计算器求各锐角的度数:(精确到,1,),(,1,),sin,=,0.7631,;,(,2,),cos,=,0.3548,;,(,3,),tan,=,2.9730.,(,1,),=,49 44,19,;,(,2,),=,69 13,8,;,(,3,),=,7124,28,.,