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(x*tgx)/lg(x+1)

Derivada de (x*tgx)/lg(x+1)

Función f() - derivada -er orden en el punto
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Gráfico:

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Solución

Ha introducido [src]
 x*tan(x) 
----------
log(x + 1)
xtan(x)log(x+1)\frac{x \tan{\left(x \right)}}{\log{\left(x + 1 \right)}}
(x*tan(x))/log(x + 1)
Solución detallada
  1. Se aplica la regla de la derivada parcial:

    ddxf(x)g(x)=f(x)ddxg(x)+g(x)ddxf(x)g2(x)\frac{d}{d x} \frac{f{\left(x \right)}}{g{\left(x \right)}} = \frac{- f{\left(x \right)} \frac{d}{d x} g{\left(x \right)} + g{\left(x \right)} \frac{d}{d x} f{\left(x \right)}}{g^{2}{\left(x \right)}}

    f(x)=xtan(x)f{\left(x \right)} = x \tan{\left(x \right)} y g(x)=log(x+1)g{\left(x \right)} = \log{\left(x + 1 \right)}.

    Para calcular ddxf(x)\frac{d}{d x} f{\left(x \right)}:

    1. Se aplica la regla de la derivada de una multiplicación:

      ddxf(x)g(x)=f(x)ddxg(x)+g(x)ddxf(x)\frac{d}{d x} f{\left(x \right)} g{\left(x \right)} = f{\left(x \right)} \frac{d}{d x} g{\left(x \right)} + g{\left(x \right)} \frac{d}{d x} f{\left(x \right)}

      f(x)=xf{\left(x \right)} = x; calculamos ddxf(x)\frac{d}{d x} f{\left(x \right)}:

      1. Según el principio, aplicamos: xx tenemos 11

      g(x)=tan(x)g{\left(x \right)} = \tan{\left(x \right)}; calculamos ddxg(x)\frac{d}{d x} g{\left(x \right)}:

      1. Reescribimos las funciones para diferenciar:

        tan(x)=sin(x)cos(x)\tan{\left(x \right)} = \frac{\sin{\left(x \right)}}{\cos{\left(x \right)}}

      2. Se aplica la regla de la derivada parcial:

        ddxf(x)g(x)=f(x)ddxg(x)+g(x)ddxf(x)g2(x)\frac{d}{d x} \frac{f{\left(x \right)}}{g{\left(x \right)}} = \frac{- f{\left(x \right)} \frac{d}{d x} g{\left(x \right)} + g{\left(x \right)} \frac{d}{d x} f{\left(x \right)}}{g^{2}{\left(x \right)}}

        f(x)=sin(x)f{\left(x \right)} = \sin{\left(x \right)} y g(x)=cos(x)g{\left(x \right)} = \cos{\left(x \right)}.

        Para calcular ddxf(x)\frac{d}{d x} f{\left(x \right)}:

        1. La derivada del seno es igual al coseno:

          ddxsin(x)=cos(x)\frac{d}{d x} \sin{\left(x \right)} = \cos{\left(x \right)}

        Para calcular ddxg(x)\frac{d}{d x} g{\left(x \right)}:

        1. La derivada del coseno es igual a menos el seno:

          ddxcos(x)=sin(x)\frac{d}{d x} \cos{\left(x \right)} = - \sin{\left(x \right)}

        Ahora aplicamos la regla de la derivada de una divesión:

        sin2(x)+cos2(x)cos2(x)\frac{\sin^{2}{\left(x \right)} + \cos^{2}{\left(x \right)}}{\cos^{2}{\left(x \right)}}

      Como resultado de: x(sin2(x)+cos2(x))cos2(x)+tan(x)\frac{x \left(\sin^{2}{\left(x \right)} + \cos^{2}{\left(x \right)}\right)}{\cos^{2}{\left(x \right)}} + \tan{\left(x \right)}

    Para calcular ddxg(x)\frac{d}{d x} g{\left(x \right)}:

    1. Sustituimos u=x+1u = x + 1.

    2. Derivado log(u)\log{\left(u \right)} es 1u\frac{1}{u}.

    3. Luego se aplica una cadena de reglas. Multiplicamos por ddx(x+1)\frac{d}{d x} \left(x + 1\right):

      1. diferenciamos x+1x + 1 miembro por miembro:

        1. Según el principio, aplicamos: xx tenemos 11

        2. La derivada de una constante 11 es igual a cero.

        Como resultado de: 11

      Como resultado de la secuencia de reglas:

      1x+1\frac{1}{x + 1}

    Ahora aplicamos la regla de la derivada de una divesión:

    xtan(x)x+1+(x(sin2(x)+cos2(x))cos2(x)+tan(x))log(x+1)log(x+1)2\frac{- \frac{x \tan{\left(x \right)}}{x + 1} + \left(\frac{x \left(\sin^{2}{\left(x \right)} + \cos^{2}{\left(x \right)}\right)}{\cos^{2}{\left(x \right)}} + \tan{\left(x \right)}\right) \log{\left(x + 1 \right)}}{\log{\left(x + 1 \right)}^{2}}

  2. Simplificamos:

    xsin(2x)2+(x+1)(x+sin(2x)2)log(x+1)(x+1)log(x+1)2cos2(x)\frac{- \frac{x \sin{\left(2 x \right)}}{2} + \left(x + 1\right) \left(x + \frac{\sin{\left(2 x \right)}}{2}\right) \log{\left(x + 1 \right)}}{\left(x + 1\right) \log{\left(x + 1 \right)}^{2} \cos^{2}{\left(x \right)}}


Respuesta:

xsin(2x)2+(x+1)(x+sin(2x)2)log(x+1)(x+1)log(x+1)2cos2(x)\frac{- \frac{x \sin{\left(2 x \right)}}{2} + \left(x + 1\right) \left(x + \frac{\sin{\left(2 x \right)}}{2}\right) \log{\left(x + 1 \right)}}{\left(x + 1\right) \log{\left(x + 1 \right)}^{2} \cos^{2}{\left(x \right)}}

Gráfica
02468-8-6-4-2-1010-25002500
Primera derivada [src]
  /       2   \                               
x*\1 + tan (x)/ + tan(x)         x*tan(x)     
------------------------ - -------------------
       log(x + 1)                     2       
                           (x + 1)*log (x + 1)
xtan(x)(x+1)log(x+1)2+x(tan2(x)+1)+tan(x)log(x+1)- \frac{x \tan{\left(x \right)}}{\left(x + 1\right) \log{\left(x + 1 \right)}^{2}} + \frac{x \left(\tan^{2}{\left(x \right)} + 1\right) + \tan{\left(x \right)}}{\log{\left(x + 1 \right)}}
Segunda derivada [src]
                                                                            /        2     \       
                  /  /       2   \         \                              x*|1 + ----------|*tan(x)
         2      2*\x*\1 + tan (x)/ + tan(x)/       /       2   \            \    log(1 + x)/       
2 + 2*tan (x) - ---------------------------- + 2*x*\1 + tan (x)/*tan(x) + -------------------------
                     (1 + x)*log(1 + x)                                             2              
                                                                             (1 + x) *log(1 + x)   
---------------------------------------------------------------------------------------------------
                                             log(1 + x)                                            
x(1+2log(x+1))tan(x)(x+1)2log(x+1)+2x(tan2(x)+1)tan(x)+2tan2(x)+22(x(tan2(x)+1)+tan(x))(x+1)log(x+1)log(x+1)\frac{\frac{x \left(1 + \frac{2}{\log{\left(x + 1 \right)}}\right) \tan{\left(x \right)}}{\left(x + 1\right)^{2} \log{\left(x + 1 \right)}} + 2 x \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} + 2 \tan^{2}{\left(x \right)} + 2 - \frac{2 \left(x \left(\tan^{2}{\left(x \right)} + 1\right) + \tan{\left(x \right)}\right)}{\left(x + 1\right) \log{\left(x + 1 \right)}}}{\log{\left(x + 1 \right)}}
Tercera derivada [src]
                                                                                                                                                /        3             3     \       
                                                                                              /        2     \ /  /       2   \         \   2*x*|1 + ---------- + -----------|*tan(x)
                                                   /       2        /       2   \       \   3*|1 + ----------|*\x*\1 + tan (x)/ + tan(x)/       |    log(1 + x)      2       |       
  /       2   \ /             /         2   \\   6*\1 + tan (x) + x*\1 + tan (x)/*tan(x)/     \    log(1 + x)/                                  \                 log (1 + x)/       
2*\1 + tan (x)/*\3*tan(x) + x*\1 + 3*tan (x)// - ---------------------------------------- + --------------------------------------------- - -----------------------------------------
                                                            (1 + x)*log(1 + x)                                  2                                             3                      
                                                                                                         (1 + x) *log(1 + x)                           (1 + x) *log(1 + x)           
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                      log(1 + x)                                                                                     
2x(1+3log(x+1)+3log(x+1)2)tan(x)(x+1)3log(x+1)+3(1+2log(x+1))(x(tan2(x)+1)+tan(x))(x+1)2log(x+1)+2(x(3tan2(x)+1)+3tan(x))(tan2(x)+1)6(x(tan2(x)+1)tan(x)+tan2(x)+1)(x+1)log(x+1)log(x+1)\frac{- \frac{2 x \left(1 + \frac{3}{\log{\left(x + 1 \right)}} + \frac{3}{\log{\left(x + 1 \right)}^{2}}\right) \tan{\left(x \right)}}{\left(x + 1\right)^{3} \log{\left(x + 1 \right)}} + \frac{3 \left(1 + \frac{2}{\log{\left(x + 1 \right)}}\right) \left(x \left(\tan^{2}{\left(x \right)} + 1\right) + \tan{\left(x \right)}\right)}{\left(x + 1\right)^{2} \log{\left(x + 1 \right)}} + 2 \left(x \left(3 \tan^{2}{\left(x \right)} + 1\right) + 3 \tan{\left(x \right)}\right) \left(\tan^{2}{\left(x \right)} + 1\right) - \frac{6 \left(x \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} + \tan^{2}{\left(x \right)} + 1\right)}{\left(x + 1\right) \log{\left(x + 1 \right)}}}{\log{\left(x + 1 \right)}}
Gráfico
Derivada de (x*tgx)/lg(x+1)