若角α的终边经过(2,-1),则sinα=

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若角α的终边经过(2,-1),则sinα=
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若角α的终边经过(2,-1),则sinα=
若角α的终边经过(2,-1),则sinα=
 

若角α的终边经过(2,-1),则sinα=
-√5/5