sin(a+30度）-cos(a+60度）/2sina=
<p>问题：sin(a+30度）-cos(a+60度）/2sina=<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">马书磊的回答：<div class="content-b">网友采纳 解；原式=(1/2cosa+√3/2sina-1/2cosa+√3/2sina)/2sina =√3sina/2sina =√3/2
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