# Find the middle terms in the expansion of (x/a - a/x)^10

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Find the middle terms in the expansion of (x/a - a/x)10

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Here, a = x/a, b = -a/x, n = 10

Now, n is even.

$\therefore\frac{n+2}2=\frac{10+2}2=6$

$\therefore$ Middle term is t6 for which r = 5