Question:

1/r-1/s OVER r^2/s^2-1?

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  1. (1/r-1/s) / r²/(s²-1)   correct?

    use parans to make things clear.

    (1/r-1/s) (s²-1) / r²

    multiply by rs/rs

    (s-r) (s²-1) / sr³

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