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In the expansion of (x +a)^n, the sums o...

In the expansion of `(x +a)^n`, the sums of the odd and the even terms are O and E respectively, prove that : `2(O^2+E^2)=(x+a)^(2n)+(x-a)^(2n)`.

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MODERN PUBLICATION-BINOMIAL THEOREM-EXERCISE
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