已知0＜x＜π/4,sin(π/4-x)=5/13,求cos2x/cos(π/4+x)的值
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已知0＜x＜π/4,sin(π/4-x)=5/13,求cos2x/cos(π/4+x)的值已知0＜x＜π/4,sin(π/4-x)=5/13,求cos2x/cos(π/4+x)的值已知0＜x＜π/4,
已知0＜x＜π/4,sin(π/4-x)=5/13,求cos2x/cos(π/4+x)的值
已知0＜x＜π/4,sin(π/4-x)=5/13,求cos2x/cos(π/4+x)的值
已知0＜x＜π/4,sin(π/4-x)=5/13,求cos2x/cos(π/4+x)的值
12√2/13