Aaaa a2+b2+4ab-2ab>0
0 \\ a^2+b^2+2ab>0 \\ (a+b)^2>0" alt="a^2+b^2+4ab-2ab>0 \\ a^2+b^2+2ab>0 \\ (a+b)^2>0" align="absmiddle" class="latex-formula">
0 \\ a^2+b^2+2ab>0 \\ (a+b)^2>0" alt="a^2+b^2+4ab-2ab>0 \\ a^2+b^2+2ab>0 \\ (a+b)^2>0" align="absmiddle" class="latex-formula">