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[tex]\psi(x_1, x_2) = \frac{1}{\sqrt{2}}[\phi_a(x_1)\phi_b(x_2) + \phi_a(x_2)\phi_b(x_1)[/tex]

And to normalise the wavefunction, the modulus squared has to be found. I can do this when I can substitute standard wavefunctions into the equations (either harmonic oscillator, or a square well for example), but I've been looking at exam papers and in questions with this kind of question, no wavefunctions are given and the answer (its normally a "show that..." question) is still given in terms of phi 1 and phi 2.

I'm unsure how the modulus squared bit works when I don't know for sure that the answer is complex. I also don't know how to integrate these without substituting values in for the wavefunctions. Any help going through this would be appreciated.