Question

show that middle term in the expansion of (x-1/x)^2n is (1×3×5..(2n-1)×(-2)^n)/n!

Answer 1

This question is similiar to ncert example ,
To solve this middle term which is n+1 th term, separate even and odd terms while solving 2n!
Then from even terms take 2 common from each term and remaining terms become n!

Go for this, All the best