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](/uploads/image/z/14275086-6-6.jpg?t=4%2A2%5En%2A2%5En-1+%28-x%29%26%23179%3B%2Ax%5E2n-1%2Bx%5E2n%2Ax%26%23178%3B)
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