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y=(sin(x)/(1+cos(x)))^2

Derivada de y=(sin(x)/(1+cos(x)))^2

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

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Solución

Ha introducido [src]
            2
/  sin(x)  \ 
|----------| 
\1 + cos(x)/ 
(sin(x)cos(x)+1)2\left(\frac{\sin{\left(x \right)}}{\cos{\left(x \right)} + 1}\right)^{2}
(sin(x)/(1 + cos(x)))^2
Solución detallada
  1. Sustituimos u=sin(x)cos(x)+1u = \frac{\sin{\left(x \right)}}{\cos{\left(x \right)} + 1}.

  2. Según el principio, aplicamos: u2u^{2} tenemos 2u2 u

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

    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)=sin(x)f{\left(x \right)} = \sin{\left(x \right)} y g(x)=cos(x)+1g{\left(x \right)} = \cos{\left(x \right)} + 1.

      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. diferenciamos cos(x)+1\cos{\left(x \right)} + 1 miembro por miembro:

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

        2. 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)}

        Como resultado de: sin(x)- \sin{\left(x \right)}

      Ahora aplicamos la regla de la derivada de una divesión:

      (cos(x)+1)cos(x)+sin2(x)(cos(x)+1)2\frac{\left(\cos{\left(x \right)} + 1\right) \cos{\left(x \right)} + \sin^{2}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}

    Como resultado de la secuencia de reglas:

    2((cos(x)+1)cos(x)+sin2(x))sin(x)(cos(x)+1)3\frac{2 \left(\left(\cos{\left(x \right)} + 1\right) \cos{\left(x \right)} + \sin^{2}{\left(x \right)}\right) \sin{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{3}}

  4. Simplificamos:

    2sin(x)(cos(x)+1)2\frac{2 \sin{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}


Respuesta:

2sin(x)(cos(x)+1)2\frac{2 \sin{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}

Gráfica
02468-8-6-4-2-1010-2000000020000000
Primera derivada [src]
      2                    /                    2     \
   sin (x)                 | 2*cos(x)      2*sin (x)  |
-------------*(1 + cos(x))*|---------- + -------------|
            2              |1 + cos(x)               2|
(1 + cos(x))               \             (1 + cos(x)) /
-------------------------------------------------------
                         sin(x)                        
sin2(x)(cos(x)+1)2(2cos(x)cos(x)+1+2sin2(x)(cos(x)+1)2)(cos(x)+1)sin(x)\frac{\frac{\sin^{2}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}} \left(\frac{2 \cos{\left(x \right)}}{\cos{\left(x \right)} + 1} + \frac{2 \sin^{2}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}\right) \left(\cos{\left(x \right)} + 1\right)}{\sin{\left(x \right)}}
Segunda derivada [src]
  /                                                                                                              /    2              \\
  |                       2                                                                                 2    | sin (x)           ||
  |  /    2              \            /            2                  \   /    2              \          sin (x)*|---------- + cos(x)||
  |  | sin (x)           |       2    |       2*sin (x)      3*cos(x) |   | sin (x)           |                  \1 + cos(x)         /|
2*|2*|---------- + cos(x)|  + sin (x)*|-1 + ------------- + ----------| - |---------- + cos(x)|*cos(x) - -----------------------------|
  |  \1 + cos(x)         /            |                 2   1 + cos(x)|   \1 + cos(x)         /                    1 + cos(x)         |
  \                                   \     (1 + cos(x))              /                                                               /
---------------------------------------------------------------------------------------------------------------------------------------
                                                                         2                                                             
                                                             (1 + cos(x))                                                              
2(2(cos(x)+sin2(x)cos(x)+1)2(cos(x)+sin2(x)cos(x)+1)cos(x)+(1+3cos(x)cos(x)+1+2sin2(x)(cos(x)+1)2)sin2(x)(cos(x)+sin2(x)cos(x)+1)sin2(x)cos(x)+1)(cos(x)+1)2\frac{2 \left(2 \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right)^{2} - \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right) \cos{\left(x \right)} + \left(-1 + \frac{3 \cos{\left(x \right)}}{\cos{\left(x \right)} + 1} + \frac{2 \sin^{2}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}\right) \sin^{2}{\left(x \right)} - \frac{\left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right) \sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right)}{\left(\cos{\left(x \right)} + 1\right)^{2}}
Tercera derivada [src]
  /                                                                                                                                       2                                                                   2            /    2              \ /                           4             2          \                                                                                                           \
  |                                                                                                                  /    2              \                     /    2              \     /    2              \             | sin (x)           | |   2         2        3*sin (x)     5*sin (x)*cos(x)|                                                                        /    2              \              |
  |                                                                                                                  | sin (x)           |                3    | sin (x)           |     | sin (x)           |           2*|---------- + cos(x)|*|cos (x) - sin (x) + ------------- + ----------------|                                                                        | sin (x)           |              |
  |/    2              \          /               2            2              4              2          \          2*|---------- + cos(x)| *sin(x)   2*sin (x)*|---------- + cos(x)|   2*|---------- + cos(x)| *cos(x)     \1 + cos(x)         / |                                2      1 + cos(x)   |     /    2              \ /            2                  \          3*|---------- + cos(x)|*cos(x)*sin(x)|
  || sin (x)           |          |          4*sin (x)    3*cos (x)      6*sin (x)     12*sin (x)*cos(x)|            \1 + cos(x)         /                     \1 + cos(x)         /     \1 + cos(x)         /                                   \                    (1 + cos(x))                    /     | sin (x)           | |       2*sin (x)      3*cos(x) |            \1 + cos(x)         /              |
2*||---------- + cos(x)|*sin(x) + |-cos(x) - ---------- + ---------- + ------------- + -----------------|*sin(x) - ------------------------------- - ------------------------------- - ------------------------------- + ------------------------------------------------------------------------------ + 2*|---------- + cos(x)|*|-1 + ------------- + ----------|*sin(x) - -------------------------------------|
  |\1 + cos(x)         /          |          1 + cos(x)   1 + cos(x)               3                 2  |                     1 + cos(x)                                  2                         sin(x)                                                   sin(x)                                         \1 + cos(x)         / |                 2   1 + cos(x)|                        1 + cos(x)             |
  \                               \                                    (1 + cos(x))      (1 + cos(x))   /                                                     (1 + cos(x))                                                                                                                                                        \     (1 + cos(x))              /                                               /
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                                                                                               2                                                                                                                                                                                                   
                                                                                                                                                                                                   (1 + cos(x))                                                                                                                                                                                                    
2(2(cos(x)+sin2(x)cos(x)+1)2cos(x)sin(x)+2(cos(x)+sin2(x)cos(x)+1)(1+3cos(x)cos(x)+1+2sin2(x)(cos(x)+1)2)sin(x)+2(cos(x)+sin2(x)cos(x)+1)(sin2(x)+cos2(x)+5sin2(x)cos(x)cos(x)+1+3sin4(x)(cos(x)+1)2)sin(x)+(cos(x)+sin2(x)cos(x)+1)sin(x)+(cos(x)4sin2(x)cos(x)+1+3cos2(x)cos(x)+1+12sin2(x)cos(x)(cos(x)+1)2+6sin4(x)(cos(x)+1)3)sin(x)2(cos(x)+sin2(x)cos(x)+1)2sin(x)cos(x)+13(cos(x)+sin2(x)cos(x)+1)sin(x)cos(x)cos(x)+12(cos(x)+sin2(x)cos(x)+1)sin3(x)(cos(x)+1)2)(cos(x)+1)2\frac{2 \left(- \frac{2 \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right)^{2} \cos{\left(x \right)}}{\sin{\left(x \right)}} + 2 \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right) \left(-1 + \frac{3 \cos{\left(x \right)}}{\cos{\left(x \right)} + 1} + \frac{2 \sin^{2}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}\right) \sin{\left(x \right)} + \frac{2 \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right) \left(- \sin^{2}{\left(x \right)} + \cos^{2}{\left(x \right)} + \frac{5 \sin^{2}{\left(x \right)} \cos{\left(x \right)}}{\cos{\left(x \right)} + 1} + \frac{3 \sin^{4}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}\right)}{\sin{\left(x \right)}} + \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right) \sin{\left(x \right)} + \left(- \cos{\left(x \right)} - \frac{4 \sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1} + \frac{3 \cos^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1} + \frac{12 \sin^{2}{\left(x \right)} \cos{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}} + \frac{6 \sin^{4}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{3}}\right) \sin{\left(x \right)} - \frac{2 \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right)^{2} \sin{\left(x \right)}}{\cos{\left(x \right)} + 1} - \frac{3 \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right) \sin{\left(x \right)} \cos{\left(x \right)}}{\cos{\left(x \right)} + 1} - \frac{2 \left(\cos{\left(x \right)} + \frac{\sin^{2}{\left(x \right)}}{\cos{\left(x \right)} + 1}\right) \sin^{3}{\left(x \right)}}{\left(\cos{\left(x \right)} + 1\right)^{2}}\right)}{\left(\cos{\left(x \right)} + 1\right)^{2}}
Gráfico
Derivada de y=(sin(x)/(1+cos(x)))^2