Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(1-x^{m-n})^{-1}+(1-x^{n-m})^{-1}$$

Evaluate

$1$

Differentiate w.r.t. x

$0$

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