【已知tana=1/2tan(a-p)=-2/5则tan(2a-p)的值】
<p>问题：【已知tana=1/2tan(a-p)=-2/5则tan(2a-p)的值】<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">倪永军的回答：<div class="content-b">网友采纳 tana=1/2,tan(a-p)=-2/5 tan(2a-p) =tan =/ =(1/2-2/5)/(1+1/2*2/5) =(5-4)/(10+2) =1/12
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