利用公式求下列三角函数值 (1)sin(-7/6π);(2)sin(-1300°);(3)cos(-79/6π).
1个回答
展开全部
sin(-7/6π)=-sin(7/6π)=sin(π+1/6π)=-sin(1/6π)=1/2
sin(-1300°)=sin(140°-4*360°)=sin(140°)=sin(50°+90°)=cos(50°)=0.643
sin(-79/6π)=sin(-12π-7/6π)=sin(-7/6π)=1/2
sin(-1300°)=sin(140°-4*360°)=sin(140°)=sin(50°+90°)=cos(50°)=0.643
sin(-79/6π)=sin(-12π-7/6π)=sin(-7/6π)=1/2
更多追问追答
追问
sin(-79/6π)=sin(-12π-7/6π)=sin(-7/6π)=1/2 ?是这样做么
追答
你的sin(-7/6π)是六分之七π的意思么,是的就是那样做的
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询