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](/uploads/image/z/987260-68-0.jpg?t=%E5%B7%B2%E7%9F%A5sin%28%CF%80%2F4-%CE%B8%29%3D5%2F13%280%EF%BC%9C%CE%B8%EF%BC%9C%CF%80%2F4%29%2C%E6%B1%82cos2%CE%B8%2Ccos%28%CF%80%2F4%2B%CE%B8%29%E7%9A%84%E5%80%BC)
已知sin(π/4-θ)=5/13(0<θ<π/4),求cos2θ,cos(π/4+θ)的值
已知sin(π/4-θ)=5/13(0<θ<π/4),求cos2θ,cos(π/4+θ)的值
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