作业帮如果sinx,cos2x,1 sinx成等比数列,则求sinx的值
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如果sinx,cos2x,1 sinx成等比数列,则求sinx的值
如果sinx,cos2x,1 sinx成等比数列,则求sinx的值
如果sinx,cos2x,1 sinx成等比数列,则求sinx的值
|sinx|=1
1/sinx>=1,1/sinx=1,cos2x
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