已知sin（x+π/4）=4/5,cos（x+π/4）=-3/5,求sinx的值
人气：264 ℃ 时间：2020-02-03 14:12:40
解答
√2/2(sinx+cosx)=4/5
√2/2(cosx-sinx)=-3/5
√2sinx=7/5
sinx=7√2/10
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