已知sin(π⼀4-α)=5⼀13 α∈(0,π⼀4) 求cos2α⼀cos(α+π⼀4)的值

2025-03-11 06:13:14
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回答1:

cos2α/cos(α+π/4)=sin(π/2-2α)/cos(α+π/4)=2sin(π/4-α)=10/13