已知αβ都是锐角,且tanα=1,则cos(α-β)/sin(α+β)=要步骤.谢了.
<p>问题：已知αβ都是锐角,且tanα=1,则cos(α-β)/sin(α+β)=要步骤.谢了.<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">程玉武的回答：<div class="content-b">网友采纳 tanα=1 α=π/4 原式=cos(π/4-β)/sin(π/4+β) =sin[π/2-(π/4-β)]/sin(π/4+β) =sin(π/4+β)/sin(π/4+β) =1
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