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## Main Question or Discussion Point

Hi Every body!

I wan to compute the power series expansion of dedekind eta function. Specifically, I want to know the power series expansion of

I wan to compute the power series expansion of dedekind eta function. Specifically, I want to know the power series expansion of

**η(τ)/η(3τ)**? How could I expand this function? I would be happy if you could help me as I am stuck at this state when I am computing the modular polynomial of prime number 3.