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If `o` be the sum of odd terms and `E` that of even terms in the expansion of `(x+a)^n` prove that: (i)`O^2-E^2=(x^2-a^2)^n` (ii) `4O E=(x+a)^(2n)-(x-a)^(2n)` (iii) `2(O^2+E^2)=(x+a)^(2n)+(x-a)^(2n)`

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