已知∠α的顶点在原点,一条边在x轴的正半轴,另一条边经过点P(3,

已知∠α的顶点在原点,一条边在x轴的正半轴,另一条边经过点P(3-4),则sinα的值是 (       

A           B           C            D

答案

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