已知点的坐标,将绕坐标原点逆时针旋转至,则点的纵坐标为(  

已知点的坐标,将绕坐标原点逆时针旋转,则点的纵坐标为(  

A                B-1                C1                    D

答案

A

【解析】

试题分析:假设与横轴非负半轴所夹角为,由点的坐标可求得 ,是由绕坐标原点逆时针旋转所得,所以有,,由三角函数与坐标的关系可知点的纵坐标,故本题的正确选项为A.

考点:三角函数与坐标的关系.

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