5) log√3 15-log^2√3 3+2log√3 15+2log√3 3 / log√3 15+log√3 3

(log√3(15) - log√3(3)^2 + 2log√3(15) + 2log√3(3)) / (log√3(15) + log√3(3)) = (3log√3(15) - log√3(3)^2 + 2log√3(3)) / (log√3(15) + log√3(3)) = (3log√3(15)) / (log√3(15) + log√3(3))