sinx=1/2+cosx,且x属于(0,π/2),则cos2x/sin(x-π/4)=
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sinx=1/2+cosx,且x属于(0,π/2),则cos2x/sin(x-π/4)=
sinx=1/2+cosx,且x属于(0,π/2),则cos2x/sin(x-π/4)=
sinx=1/2+cosx,且x属于(0,π/2),则cos2x/sin(x-π/4)=