其他 返回
天气预报 > 其他 > sin在第几象限是正的
sin在第几象限是正的
更新时间： 2020-10-29 00:00:00  

sin在第一、二象限是正的。sin指正弦函数，是三角函数的一种。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，即sinA=∠A的对边/斜边。正弦=股长/弦长，弦是圆周上两点连线。最大的弦是直径。把直角三角形的弦放在直径上，股就是∠A所对的弦即正弦。

关键词： sin 象限

sin在第几象限是正的相关经验

天气预报

最新推荐

页面:/news/view-2973879/ | 耗时:0.4331 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=2973879 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2973879 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2973879 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1061534,1054380,1084427,1275834,1027251,1063981,1027455,1370312,1101707,1064977,1049836,2666365,1121936,1079682,1079890,1053308,1114918,2390057,1103070,1108051,1128709,1065083,1100527,1048878,1063021,1065023,1059915,3030228,1041729,1083421) ORDER BY field (ArticleID,1061534,1054380,1084427,1275834,1027251,1063981,1027455,1370312,1101707,1064977,1049836,2666365,1121936,1079682,1079890,1053308,1114918,2390057,1103070,1108051,1128709,1065083,1100527,1048878,1063021,1065023,1059915,3030228,1041729,1083421)