cos1°+cos2°+cos3°+........+cos178°+cos179°=?
3个回答
2017-06-14
展开全部
cos1°+cos2°+cos3°+........+cos178°+cos179°
=cos1°+cos179°+cos2°+cos178°+cos3°+........cos90°
=0
=cos1°+cos179°+cos2°+cos178°+cos3°+........cos90°
=0
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
∵os1+cos179
=cos1+cos(180-1)
=cos1-cos1
=0
∴雀枯局顷让败瞎cosx+cos(180-x)=0
因此
cos1°+cos2°+cos3°+······+cos180°
=(cos1+cos179)+(cos2+cos178)+······+(cos89+cos91)+cos90
=0+0+······+0+0
=0
=cos1+cos(180-1)
=cos1-cos1
=0
∴雀枯局顷让败瞎cosx+cos(180-x)=0
因此
cos1°+cos2°+cos3°+······+cos180°
=(cos1+cos179)+(cos2+cos178)+······+(cos89+cos91)+cos90
=0+0+······+0+0
=0
本回答被提问者采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询