由sin(x+π/4)=1/3得sinx+cosx=√2/3,由X∈(π/2,π)知sinx>0,cosx<0,由(sinx)^2+(cosx)^2=1代入上式得sinx=(√2+4)/6
已知sin(X+π/4)=1/3,X∈(π/2,π)求sinX
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