c(A\cupB)sと同様に
全体を斜線で塗りつぶし\BKinziOresenで
A\capBの部分を指定し，白塗りすればできます

\documentclass{jarticle}
\usepackage{emathPp}

\begin{document}
\begin{zahyou*}[ul=6mm](0,10)(0,8)
\fboxsep=1pt
\def\Ax{3}\def\Ay{4}
\def\Bx{6.5}\def\By{4}
\def\hankeiA{2}
\def\hankeiB{3}
\tenretu*{A(\Ax,\Ay);B(\Bx,\By)}
\def\waku{%
  (\xmin,\ymin)(\xmax,\ymin)(\xmax,\ymax)(\xmin,\ymax)(\xmin,\ymin)}%
\Nuritubusi*<.3>\waku
\Drawline\waku
\En\A\hankeiA
\En\B\hankeiB
\kyokuTyoku[\A](\hankeiA,135)\AA
\kyokuTyoku[\B](\hankeiB,45)\BB
\CandC\A\hankeiA\B\hankeiB\P\Q
\Subvec\P\A\AP\Argvec\AP\henkakuAP
\Subvec\Q\A\AQ\Argvec\AQ\henkakuAQ
\Subvec\P\B\BP\Argvec\BP\henkakuBP
\Subvec\Q\B\BQ\Argvec\BQ\henkakuBQ
\def\AFx{\Ax+\hankeiA*cos($pi*T/180)}
\def\AFy{\Ay+\hankeiA*sin($pi*T/180)}
\def\BFx{\Bx+\hankeiB*cos($pi*T/180)}
\def\BFy{\By+\hankeiB*sin($pi*T/180)}
\BKinziOresen\AFx\AFy\henkakuAP\henkakuAQ{1}\AkoPQ
\Add\henkakuBP{360}\henkakuBPii
\BKinziOresen\BFx\BFy\henkakuBQ\henkakuBPii{1}\BkoQP
\edef\oresen{\P\AkoPQ\BkoQP\P}
\Nuritubusi[0]\oresen
\En\A\hankeiA
\En\B\hankeiB
\Put\AA(0,0){\colorbox{white}{$A$}}
\Put\BB(0,0){\colorbox{white}{$B$}}
\Put{(5,\ymax)}[n]{$\conj{A\cap B}$}
\Put{(\xmin,\ymax)}(10mm,0){\colorbox{white}{$U$}}
\end{zahyou*}
\end{document}

不要な行が入っているかもしれません

▼関連発言
│
└◆1135:c(A\capB)s [toshi] 05/21 12:47
　└◆1136:Re:c(A\capB)s [石原　守] 05/21 14:57
　　└◆1139:Re[2]:c(A\capB)s [toshi] 05/21 18:48<-last