打开windows计算器,在菜单总选择查看->科学模式就行了
sin15=0.25881904510252076234889883762405
cos15=0.9659258262890682867497431997289
sin27=0.45399049973954679156040836635787
cos75=0.25881904510252076234889883762405
sin75=0.9659258262890682867497431997289
tan75=3.7320508075688772935274463415059