利用和（差）角公式求下列各三角函数的值.1cos（（-61/12）π）=____________2tan((35π)/12)=____________________
<p>问题：利用和（差）角公式求下列各三角函数的值.1cos（（-61/12）π）=____________2tan((35π)/12)=____________________<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">李延磊的回答：<div class="content-b">网友采纳 1、 原式=cos(-3*π+11π/12) =cos(11π/12) =cos(π/4+2π/3) =cosπ/4cos2π/3-sinπ/4sin2π/3 =-(√6+√2)/4 2、 原式=tan(3π-π/12) =tan(-π/12) =tan(π/4-π/3) =(tanπ/4-tanπ/3)/(1+tanπ/4tanπ/3) =-2+√3
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