作业帮第6、7题,
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/05/15 01:24:24
第6、7题,
6、
(sin1°)^2+(sin89°)^2=(sin1°)^2+(cos1°)^2=1
(sin2°)^2+(sin88°)^2=1
(sin3°)^2+(sin87°)^2=1
……
(sin44°)^2+(sin46°)^2=1
(sin45°)^2=1/2
所以结果=44.5
7、
(sin48°)^2+(sin42°)^2=1
tan44°*tan46°*tan45°
=(sin44°/cos44°)*(sin46°/cos46°)*1
=(sin44°/cos44°)*(cos44°/sin44°)*1
=1
所以结果=0
(sin1°)^2+(sin89°)^2=(sin1°)^2+(cos1°)^2=1
(sin2°)^2+(sin88°)^2=1
(sin3°)^2+(sin87°)^2=1
……
(sin44°)^2+(sin46°)^2=1
(sin45°)^2=1/2
所以结果=44.5
7、
(sin48°)^2+(sin42°)^2=1
tan44°*tan46°*tan45°
=(sin44°/cos44°)*(sin46°/cos46°)*1
=(sin44°/cos44°)*(cos44°/sin44°)*1
=1
所以结果=0