已知sin(π/4-θ)=5/13(0＜θ＜π/4),求cos2θ,cos(π/4+θ)的值

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已知sin(π/4-θ)=5/13(0＜θ＜π/4),求cos2θ,cos(π/4+θ)的值

sin(π/4-θ)=5/13,0＜θ＜π/4
0＜π/4-θ