【数学】高一三角函数题已知25sin^2α+sinα-24=0,且α为第一象限角,则cos(α/2)为:A.±4/5B.±3/5C.4/5D.3/5符号可在此复制:α π ≥ ≤ > < ±附加注明:条件第一项为25(sinα)^2,不是二倍角
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/30 03:44:36
![【数学】高一三角函数题已知25sin^2α+sinα-24=0,且α为第一象限角,则cos(α/2)为:A.±4/5B.±3/5C.4/5D.3/5符号可在此复制:α π ≥ ≤ > < ±附加注明:条件第一项为25(sinα)^2,不是二倍角](/uploads/image/z/9300589-61-9.jpg?t=%E3%80%90%E6%95%B0%E5%AD%A6%E3%80%91%E9%AB%98%E4%B8%80%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E9%A2%98%E5%B7%B2%E7%9F%A525sin%5E2%CE%B1%2Bsin%CE%B1-24%3D0%2C%E4%B8%94%CE%B1%E4%B8%BA%E7%AC%AC%E4%B8%80%E8%B1%A1%E9%99%90%E8%A7%92%2C%E5%88%99cos%28%CE%B1%2F2%29%E4%B8%BA%EF%BC%9AA.%C2%B14%2F5B.%C2%B13%2F5C.4%2F5D.3%2F5%E7%AC%A6%E5%8F%B7%E5%8F%AF%E5%9C%A8%E6%AD%A4%E5%A4%8D%E5%88%B6%EF%BC%9A%CE%B1+%CF%80+%E2%89%A5+%E2%89%A4+%EF%BC%9E+%EF%BC%9C+%C2%B1%E9%99%84%E5%8A%A0%E6%B3%A8%E6%98%8E%EF%BC%9A%E6%9D%A1%E4%BB%B6%E7%AC%AC%E4%B8%80%E9%A1%B9%E4%B8%BA25%28sin%CE%B1%29%5E2%EF%BC%8C%E4%B8%8D%E6%98%AF%E4%BA%8C%E5%80%8D%E8%A7%92)
xS[O`+ vtPÄy87f-rri' 1,G /zb,=>{,NJsNj[i>dul?yPof@
1C4Co*,M0v7x75~Mi=ï!όC2$:)ZDnq77TJܨ _BO~TN-o->?+ CO|h'%?a2yԙg2kX'`A~q2XjPӪJw[ɦCdT&x!̑L`_:QW~rUXxQMY^ JuU0Mr4?ccK:lMc(YSvJѥ9`1h~EAEQfEzh)o`@mFBqIpK9VO~֎\VĈd*#֖)71G2-i:a\-w
=nH*|j4!(L
h