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已知角α的正弦线是单位长度的有向线段,那么角α的终边在( ) A.x轴上 B.y...
已知角α的正弦线是单位长度的有向线段,那么角α的终边在( )
A.x轴上
B.y轴上
C.直线y=x上
D.直线y=-
考点分析:
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