【已知随机变量X～U(-π,π),试求Y=cosX和Y^2=cos^2(X)已知随机变量X～U(-π,π),试求Y=cosX和Y^2=cos^2(X)】
<p>问题：【已知随机变量X～U(-π,π),试求Y=cosX和Y^2=cos^2(X)已知随机变量X～U(-π,π),试求Y=cosX和Y^2=cos^2(X)】<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">洪榛的回答：<div class="content-b">网友采纳 Y=cosX f(y)=f(x1)/|y'(x1)|+f(x2)/|y'(x2)| =2(1/2pi)/sin(arccosy) =(1/pi)(1-y^2)^(1/2),-1
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