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In the expansion of (x^2+1+1/(x^2))^n ,n...

In the expansion of `(x^2+1+1/(x^2))^n ,n in N ,` (a)number of terms is`2n+1` (b)coefficient of constant terms is `2^(n-1)` (c)coefficient of `x^(2n-1)i sn` (d)coefficient of `x^2` in `n`

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