Below degree $2m$, a polynomial with $P(\zeta X,\zeta^{-1}Y)=-P(X,Y)$ has the form $X^mA(XY)+Y^mB(XY)$

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Below degree $2m$, a polynomial with $P(\zeta X,\zeta^{-1}Y)=-P(X,Y)$ has the form $X^mA(XY)+Y^mB(XY)$ · Prove2Me