4*2^n*2^n-1 (-x)³*x^2n-1+x^2n*x²

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4*2^n*2^n-1 (-x)³*x^2n-1+x^2n*x²
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4*2^n*2^n-1 (-x)³*x^2n-1+x^2n*x²
4*2^n*2^n-1 (-x)³*x^2n-1+x^2n*x²

4*2^n*2^n-1 (-x)³*x^2n-1+x^2n*x²
4*2^n*2^n-1
=2^2*2^n*2^n-1
=2^2n+1
(-x)³*x^2n-1+x^2n*x²
=-x^2n+2+x^2n+2
=0