How to prove Rayleigh-Jeans Law when frequency is approaching 0, chemistry homework help

We know the energy of an oscillator E = nhv, where v is the frequency and n is an integer and we know E = hv. As frequency approaches zero the Energy is very small and continuous and essentially the classical limit. Knowing this, how do we prove that How to prove Rayleigh-Jeans Law when frequency is approaching 0, chemistry homework helpwhen frequency is approaching zero, using the series expansion for e^x.

I am not too sure where to start to derive the equation, such as which equation to begin with. Any help is appreciated!

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