化简 sin(1440°+α).cos(α-1080°﹚∕cos﹙﹣180°-α﹚.sin﹙﹣α-180°﹚

来源:学生作业帮助网 编辑:作业帮 时间:2024/10/02 10:50:27
化简 sin(1440°+α).cos(α-1080°﹚∕cos﹙﹣180°-α﹚.sin﹙﹣α-180°﹚
x){3< CCmK/8^C uL 9ņ`=@;gB!mig~ ݎj-klfeVf-\-cb7hՃ"lDqP$vn6 v{V,6MS_bT~qAb(&%

化简 sin(1440°+α).cos(α-1080°﹚∕cos﹙﹣180°-α﹚.sin﹙﹣α-180°﹚
化简 sin(1440°+α).cos(α-1080°﹚∕cos﹙﹣180°-α﹚.sin﹙﹣α-180°﹚

化简 sin(1440°+α).cos(α-1080°﹚∕cos﹙﹣180°-α﹚.sin﹙﹣α-180°﹚
sin(1440°+α)=sin(360*4+α)=sinα
cos(α-1080°)=cos(α-360°*3)=cosα
cos(﹣180°-α).=cos(180°+α)=-cosα
sin(﹣α-180°)=-sin(α+180°)=-(-sinα)=sinα
原式=(sinα*cosα)/(-cosα*sinα)=-1