求值:2sin50°+cos10°(1+根号3tan10°)/根号下1+2sin50°cos50°
<p>问题：求值:2sin50°+cos10°(1+根号3tan10°)/根号下1+2sin50°cos50°<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">范明天的回答：<div class="content-b">网友采纳 2sin50°+cos10°(1+根号3tan10°)/根号下1+2sin50°cos50° =(2sin50°+cos10°(1+√3*tan10°))/√(sin^250°+2sin50°cos50°+cos^250°) =(2sin50°+cos10°+√3sin10°)/√√(sin50°+cos50°)^2 =(2sin50°+2sin(10°+30°))/(sin50°+cos50°) =2(sin50°+sin40°)/(sin50°+cos50°) =2(sin50°+cos50°)/(sin50°+cos50°) =2<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">宋妍的回答：<div class="content-b">网友采纳 2(sin50°+sin40°)/(sin50°+cos50°)这一步怎么来的？没看懂！<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">范明天的回答：<div class="content-b">网友采纳 cos10°+√3sin10°=2(1/2cos10°+√3/2sin10°)=2(sin30°cos10°+cos30°sin10°)=2sin(30°+10°)=2sin40°
页:
[1]