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( Ex: 好 ou 你好 ou 花好月圆 )
zhèng xián
正弦 zhèng xián
除了在角的终边上的顶点外,任何点的Y坐标被该点和顶点的距离所除,顶点和平面直角坐标系的原点重合,而角的初始边和正X轴相重合
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