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Prueba de Drutex

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$$ \int \ln(x) \;dx = \int 1 \cdot \ln(x) \;dx \ = x \cdot \ln(x) - \int x \cdot \frac{1}{x} \;dx \ = x \cdot \ln(x) - x$$

 

$$f(x)=\dfrac{x+1}{x-1}$$