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-1/4 e^(-i n x-i n^2 x)+1/4 e^(i n x-i n^2 x)+1/4 e^(-i n x+i n^2 x)-1/4 e^(i n x+i n^2 x)
-1/4 e^(-i n x-i n^2 x)+1/4 e^(i n x-i n^2 x)+1/4 e^(-i n x+i n^2 x)-1/4 e^(i n x+i n^2 x)
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