%\documentstyle[farsi]{book} %\input{amssym.tex} %\begin{document} \section[âމ ) (, 7731] {Ɖ\hamze âމ \hamze މ Ǎ ȉ\\* ) (, \InE{}~\EnE{} \InE{}~\EnE{}7731 } \begin{enumerate} \item ԉ ԉ\hamze \InE{}$m\times n$\EnE{} \InE{}$m\times n$\EnE{}  ډ ԉ . ܉\hamze ԉ ω    ¢ ԉ މ ؉  .   ԉ  ܉\hamze )  \hamze щ ܉ ȉ ( ȉ . ܉\hamze \InE{}$(m,n)$\EnE{}   ܉\hamze . \item ­  \InE{}$M$\EnE{} \InE{}$N$\EnE{} ։Ή ܉ \InE{}$ABC$\EnE{}  \InE{}$\angle {MAB}=\angle {NAC}$\EnE{} \InE{}$\angle {MBA}=\angle {NBC}$\EnE{} ,  $$\frac {AM \times AN}{AB \times AC} + \frac {BM \times BN}{BA \times BC} + \frac {CM \times CN} {CA \times CB} = 1$$ \vspace*{-1cm} \item ܉\hamze \InE{}$f:\Bbb R \longrightarrow \Bbb R $\EnE{}    \InE{}$x,y \in R$\EnE{} : $$f(f(x)+y) = f(x^2-y)+4f(x)y$$ \vspace*{-1cm} \end{enumerate} %\end{document}