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 <question type="category"><category><text>1MA 09. DERIVADES/1MA.09.1 DerivadaRectaTgNormal</text></category></question>
 
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      <text>1MA.09.1.20DT DERIVABILITAT</text>
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<td style="background-color: #003300; background-image: none; color: #ff9900; text-align: center; vertical-align: middle; border-style: none;" valign="top" width="100%"><span style="font-size: large; color: #ffff99;">Derivabilitat d'una funció</span></td>
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<div align="justify"><span style="font-size: small; color: #003300;">Una funció és derivable en el punt d'abscissa x<sub>0</sub> si i només si les derivades laterals existeixen i són iguals:</span><br />
<div align="center"><span class="nolink" style="font-size: small; color: #003300;">«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«munder mathcolor=¨#003300¨»«mo largeop=¨true¨ mathvariant=¨bold¨»l§#237;m«/mo»«mrow»«mi mathvariant=¨bold¨»h«/mi»«mo mathvariant=¨bold¨»§#8594;«/mo»«mn mathvariant=¨bold¨»0«/mn»«/mrow»«/munder»«mfrac mathcolor=¨#003300¨»«mrow»«mi mathvariant=¨bold¨»f«/mi»«mo mathvariant=¨bold¨»(«/mo»«msub»«mi mathvariant=¨bold¨»x«/mi»«mn mathvariant=¨bold¨»0«/mn»«/msub»«mo mathvariant=¨bold¨»-«/mo»«mi mathvariant=¨bold¨»h«/mi»«mo mathvariant=¨bold¨»)«/mo»«mo mathvariant=¨bold¨»-«/mo»«mi mathvariant=¨bold¨»f«/mi»«mo mathvariant=¨bold¨»(«/mo»«msub»«mi mathvariant=¨bold¨»x«/mi»«mn mathvariant=¨bold¨»0«/mn»«/msub»«mo mathvariant=¨bold¨»)«/mo»«/mrow»«mi mathvariant=¨bold¨»h«/mi»«/mfrac»«mo mathvariant=¨bold¨ mathcolor=¨#003300¨»=«/mo»«munder mathcolor=¨#003300¨»«mo largeop=¨true¨ mathvariant=¨bold¨»l§#237;m«/mo»«mrow»«mi mathvariant=¨bold¨»h«/mi»«mo mathvariant=¨bold¨»§#8594;«/mo»«mn mathvariant=¨bold¨»0«/mn»«/mrow»«/munder»«mfrac mathcolor=¨#003300¨»«mrow»«mi mathvariant=¨bold¨»f«/mi»«mo mathvariant=¨bold¨»(«/mo»«msub»«mi mathvariant=¨bold¨»x«/mi»«mn mathvariant=¨bold¨»0«/mn»«/msub»«mo mathvariant=¨bold¨»+«/mo»«mi mathvariant=¨bold¨»h«/mi»«mo mathvariant=¨bold¨»)«/mo»«mo mathvariant=¨bold¨»-«/mo»«mi mathvariant=¨bold¨»f«/mi»«mo mathvariant=¨bold¨»(«/mo»«msub»«mi mathvariant=¨bold¨»x«/mi»«mn mathvariant=¨bold¨»0«/mn»«/msub»«mo mathvariant=¨bold¨»)«/mo»«/mrow»«mi mathvariant=¨bold¨»h«/mi»«/mfrac»«/mrow»«/mstyle»«/math»</span><br /><br />
<div align="justify"><span style="font-size: small; color: #003300;">que també es pot escriure f'<sub>-</sub>(x) = f'<sub>+</sub>(x)</span></div>
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<div style="text-align: left;"> </div>
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