Determine the greatest value of the expression E = http://www4c.wolframalpha.com/Calcul...4&w=129.&h=18., where a,b,c are real numbers satisfying http://www4c.wolframalpha.com/Calcul...18&w=82.&h=18. and http://www4c.wolframalpha.com/Calcul...6&w=103.&h=18.