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Sagot :

u/(u-v)'
=(u'(u-v)-u(u'-v'))/(u-v)²
=(uu'-vu'-uu'+uv')/'(u-v)²
=(uv'-u'v)/(u-v)²

 (1/u-v)'
=-(u'-v')/(u-v)²
=(v'-u')/(u-v)²

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