質問: if `x+y=1`,show that `d^n(x^ny^n)=n![y^n-(nc_1)^2 y^(n-1) x+(nc_2)^2 y^(n-2) x^2+.....+(-1)^n x^n]` if `x+y=1`,show that `d^n(x^ny^n)=n![y^n-(nc_1)^2 y^(n-1) x+(nc_2)^2 y^(n-2) x^2+.....+(-1)^n x^n]`
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