Question Number 61700 by aliesam last updated on 06/Jun/19
Answered by tanmay last updated on 06/Jun/19
$${a}=−{b}−{c} \\ $$$${a}^{\mathrm{2}} =−{ab}−{ac} \\ $$$$\frac{−{ab}−{ac}}{−{ab}−{bc}−{ac}}+\frac{−{ab}−{bc}}{−{ab}−{bc}−{ca}}+\frac{−{ac}−{bc}}{−{ac}−{bc}−{ab}} \\ $$$$=\frac{−\mathrm{2}\left({ab}+{bc}+{ac}\right)}{−\left({ab}+{bc}+{ac}\right)} \\ $$$$=\mathrm{2} \\ $$