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Fc=1/sqrt(L*C)
where L and C is the filter inductance and capacitance
and the cut off frequency is equal 5% to 25% of the fundamental frequency of the output voltage so you assume one value of L or C and calculate the other one from the previous equation
Added after 10 minutes:
Sorry
the cut off frequency is equal 5% to 25% of the switching frequency not of the fundamental frequency
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