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Xn = x^n + x^(n-2) + x^(n-4) + ... + 1/[x^(n-4)] + 1/[x^(n-2)] + 1/(x^n)

(where n is a non-negative integer)

then ,

X1 = x + 1/x

X3 = x^3 + x + 1/x + 1/(x^3)

What s the value of X2??

X2 = x^2 + x^0 + 1/(x^2) = x^2 + 1 + 1/(x^2)

or X2 = x^2 + x^0 + 1/(x^0) + 1/(x^2) = x^2 + 1 + 1 + 1/(x^2)

????

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