How do I solve this?

Consider a non-interacting gas of N spinless Bosons confined to two dimension (e.g. on a surface) of area L2. We want to calculate if Bose-Einstein Condensation is possible for both massive and massless Bosons in 2D.Now consider massless Bosons, such that the allowed quantum energies are now given by niThe Ei = L n. = np +ny, nx, ny = 1, 2, 3, . .. (c) (3 points) Determine the density of states for a massless spinless Boson in 2D. (d) (2 points) As in part (b), write the integral expression for the total number of particles in all excited states Ner in 2D. Comparing your expression with the 3D one and comment if Bose-Einstein Condensation (i.e. where Ner