已知角α的终边过点P(﹣8m,﹣6sin30°),且cosα=﹣,则m的值为   

已知角α的终边过点P(﹣8m,﹣6sin30°),且cosα=,则m的值为     sinα=     

答案

    ﹣ 

【解答】解:由题意可得x=8my=6sin30°=3r=|OP|=

cosα==

解得m=

sinα=

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