Answer :
sqrt(e^4) = e^2
ln[sqrt(e^4)] = ln[e^2] = 2ln[e] = 2
sqrt[ln(e^4)] = sqrt[4ln(e)] = sqrt[4] = 2
2 - 2 = 0.
ln[sqrt(e^4)] = ln[e^2] = 2ln[e] = 2
sqrt[ln(e^4)] = sqrt[4ln(e)] = sqrt[4] = 2
2 - 2 = 0.