sin (973/2π)
=sin(972/2π+π/2)
=sin(486π+π/2)
=sinπ/2
=1
sin (374π/2) sin(374π/6) 【不加π只能用計(jì)算器算】
=sin(187π)sin(187π/3)
=0*sin(187π/3)
=0是我寫(xiě)錯(cuò)了sin (973/2π) ,sin (374/2π) sin(374/6π)求三角函數(shù)值,要有過(guò)程算好了過(guò)程嘞？過(guò)程給我啊，不然我不會(huì)啊這就是過(guò)程呀，已經(jīng)很詳細(xì)的了，你一點(diǎn)都不會(huì)呀，沒(méi)學(xué)呀1sin(2kπ+a)=sinasin(486π+π/2)=sinπ/2=1sinπ/2=sin90º=12∵sin(kπ)=0∴sin(187π)=0算了，你哪里不會(huì)，具體追問(wèn)吧sin (374/2π)這個(gè)的跟sin(374/6π)，這是兩個(gè)題應(yīng)該用逗號(hào)隔開(kāi)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