天气预报15天查询> 其他> sin乘以cos等于什么

sin乘以cos等于什么

更新时间: 2020-11-17 00:00:00     

sin乘以cos等于1/2sin2a,sinαbai·ducosβ=(1/2)[sin(α+β)+sin(α-β)]。sin一般指的是正弦,是数学术语。在直角三角形中,任意一锐角∠A的对边与斜边的比叫做∠A的正弦,记作sinA(由英语sine一词简写得来),即sinA=∠A的对边/斜边。正弦是股与弦的比例,余弦是余下的那条直角边与弦的比例。

关键词: sin 乘以 cos 等于 什么

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-751131/ | 耗时:0.5093 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=751131 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=751131 LIMIT 0,1
select * from tbl_Articles_sphinx where id=751131 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1075881,1087825,1049548,1074177,1041607,1085170,1083951,1068016,1052245,1071679,1080677,1067027,1064675,1075606,1090424,1087439,1068258,1066852,1077348,1090699,1086270,1051403,1083118,1078521,1081187,1074198,1073399,1076241,1062712,1068296) ORDER BY field (ArticleID,1075881,1087825,1049548,1074177,1041607,1085170,1083951,1068016,1052245,1071679,1080677,1067027,1064675,1075606,1090424,1087439,1068258,1066852,1077348,1090699,1086270,1051403,1083118,1078521,1081187,1074198,1073399,1076241,1062712,1068296)