New answers tagged mathématiques
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Confondues doesn't mean "combined", it's closer to "confused" when it means indistinguishable.
So deux droites confondues means two straigth lines that are impossible to distinguish from each other, i.e. two straight lines that might have different definitions but that share all of their points.
See the TLFi:
CONFONDRE, verbe trans.
I.− [L'accent est ...
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