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That is your formula: <math>|\frac{1}{2^n}\sum_{x=0}^{2^n-1}(-1)^{f(x)}|^2</math>. And how you can explain for example this <math>|\frac{1}{2^2}\sum_{x=0}^{2^2-1}(-1)^{f(x)}|^2=|\frac{1}{2^2}((-1)^{f(00)}+(-1)^{f(01)}+(-1)^{f(10)}+(-1)^{f(11)}|^2</math>?
P.S. I think, what algebra is very stupid thing and better be only clear mathematic without algebra...
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