# math

factor
((r/s + s/r)) / ((r^2/s^2 - s^2/r^2))

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1. =[ (r^2 + s^2)/(rs) ] / [ (r^4 - s^4)/(r^2s^2) ]
= (r^2 + s^2)/(rs) [(r^2s^2)/((r^2+s^2)(r^2-s^2))

= rs/(r^2-s^2)

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