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<Text-field style="Heading 1" layout="Normal">cusp,</Text-field>
<Text-field style="Text" layout="Normal"><Font italic="true">n.</Font> <Font encoding="UTF-8">um ponto em que dois ramos de uma curva se encontra, e na qual os limites do plano tangente em cada ramo coincidem. \303\211 uma</Font> <Font encoding="UTF-8" italic="true">extremidade da primeira esp\303\251cie</Font> <Font encoding="UTF-8">se os dois ramos est\303\243o em lados opostos da tangente comum como em (a)</Font></Text-field>
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<Text-field style="Text" layout="Normal">e uma extremidade do segundo tipo <Font encoding="UTF-8">se eles est\303\243o do mesmo lado, como em (b). \303\211 uma </Font><Font italic="true">extremidade ao dobro</Font> ou o ponto de <Hyperlink linktarget="Dictionary:Definition/osculation" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman" encoding="UTF-8">oscula\303\247\303\243o</Font></Hyperlink> se as curvas estender em ambos os lados do limite.</Text-field>
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