sin (973/2π) ,sin (374/2) sin(374/6)求三角函数值,
问题描述：
sin (973/2π) ,sin (374/2) sin(374/6)求三角函数值,
答
sin (973/2π)
=sin(972/2π+π/2)
=sin(486π+π/2)
=sinπ/2
=1
sin (374π/2) sin(374π/6) 【不加π只能用计算器算】
=sin(187π)sin(187π/3)
=0*sin(187π/3)
=0是我写错了sin (973/2π) ,sin (374/2π) sin(374/6π)求三角函数值,要有过程算好了过程嘞？过程给我啊，不然我不会啊这就是过程呀，已经很详细的了，你一点都不会呀，没学呀1sin(2kπ+a)=sinasin(486π+π/2)=sinπ/2=1sinπ/2=sin90º=12∵sin(kπ)=0∴sin(187π)=0算了，你哪里不会，具体追问吧sin (374/2π)这个的跟sin(374/6π)，这是两个题应该用逗号隔开呀！sin (374π/2)=sin(187π)=0 sin(374π/6)=sin(187π/3)=sin(186π/3+π/3)=sin(62π+π/3)=sinπ/3=√3/2