Find the coefficient of 1/x in the expansion of (1+x)^n(1/x+x)^n

CBSE Class 11
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Find the coefficient of 1/x in the expansion of (1+x)n(1/x+x)n
If the sum of binomial coefficients of the expansion (2x+1/x)n is equal to 256, then find the term independent of x

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