3) 2log3^2 2-log3 18-log3 2 log3 18 / 2log3 2+log3 18

(2log3(2)^2 - log3(18) - log3(2)log3(18)) / (2log3(2) + log3(18)) = (2log3(2)^2 - log3(2*3^2) - log3(2)log3(2*3^2)) / (2log3(2) + log3(2*3^2)) = (2log3(2)^2 - log3(2) - 2log3(3) - log3(2)(log3(2) + 2log3(3))) / (2log3(2) + log3(2) + 2log3(3)) = (2log3(2)^2 - log3(2) - 2 - log3(2)^2 - 2log3(2)) / (3log3(2) + 2) = (log3(2)^2 - 3log3(2) - 2) / (3log3(2) + 2)