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Límite de la función cot(x)^sin(x)*(cos(x)*log(cot(x))+(-1-cot(x)^2)*sin(x)/cot(x))

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Solución

Ha introducido [src]
     /             /                     /        2   \       \\
     |   sin(x)    |                     \-1 - cot (x)/*sin(x)||
 lim |cot      (x)*|cos(x)*log(cot(x)) + ---------------------||
x->0+\             \                             cot(x)       //
$$\lim_{x \to 0^+}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right)$$
Limit(cot(x)^sin(x)*(cos(x)*log(cot(x)) + ((-1 - cot(x)^2)*sin(x))/cot(x)), x, 0)
Método de l'Hopital
Tenemos la indeterminación de tipo
0/0,

tal que el límite para el numerador es
$$\lim_{x \to 0^+} \cot^{\sin{\left(x \right)} - 1}{\left(x \right)} = 0$$
y el límite para el denominador es
$$\lim_{x \to 0^+} \frac{1}{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)} \cot{\left(x \right)}} = 0$$
Vamos a probar las derivadas del numerador y denominador hasta eliminar la indeterminación.
$$\lim_{x \to 0^+}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right)$$
=
Introducimos una pequeña modificación de la función bajo el signo del límite
$$\lim_{x \to 0^+}\left(\frac{\left(\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)} \cot{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}}{\cot{\left(x \right)}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{\frac{d}{d x} \cot^{\sin{\left(x \right)} - 1}{\left(x \right)}}{\frac{d}{d x} \frac{1}{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)} \cot{\left(x \right)}}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{\log{\left(\cot{\left(x \right)} \right)}^{3} \cos^{3}{\left(x \right)} \cot^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \log{\left(\cot{\left(x \right)} \right)}^{2} \sin{\left(x \right)} \cos^{2}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \log{\left(\cot{\left(x \right)} \right)}^{2} \sin{\left(x \right)} \cos^{2}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)}^{2} \cos^{2}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)}^{2} \cos^{2}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \log{\left(\cot{\left(x \right)} \right)} \sin^{2}{\left(x \right)} \cos{\left(x \right)} \cot^{4}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 6 \log{\left(\cot{\left(x \right)} \right)} \sin^{2}{\left(x \right)} \cos{\left(x \right)} \cot^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \log{\left(\cot{\left(x \right)} \right)} \sin^{2}{\left(x \right)} \cos{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 2 \log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cos{\left(x \right)} \cot^{4}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 4 \log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cos{\left(x \right)} \cot^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 2 \log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cos{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - \sin^{3}{\left(x \right)} \cot^{5}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \sin^{3}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \sin^{3}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - \frac{\sin^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)}}{\cot{\left(x \right)}} + \sin^{2}{\left(x \right)} \cot^{5}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \sin^{2}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \sin^{2}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + \frac{\sin^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)}}{\cot{\left(x \right)}}}{\left(\log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cot{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)} \cot^{2}{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)} - 2 \sin{\left(x \right)} \cot^{3}{\left(x \right)} - 2 \sin{\left(x \right)} \cot{\left(x \right)} + 2 \cos{\left(x \right)} \cot^{2}{\left(x \right)} + 2 \cos{\left(x \right)}\right) \cot{\left(x \right)}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{\log{\left(\cot{\left(x \right)} \right)}^{3} \cos^{3}{\left(x \right)} \cot^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \log{\left(\cot{\left(x \right)} \right)}^{2} \sin{\left(x \right)} \cos^{2}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \log{\left(\cot{\left(x \right)} \right)}^{2} \sin{\left(x \right)} \cos^{2}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)}^{2} \cos^{2}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)}^{2} \cos^{2}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \log{\left(\cot{\left(x \right)} \right)} \sin^{2}{\left(x \right)} \cos{\left(x \right)} \cot^{4}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 6 \log{\left(\cot{\left(x \right)} \right)} \sin^{2}{\left(x \right)} \cos{\left(x \right)} \cot^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \log{\left(\cot{\left(x \right)} \right)} \sin^{2}{\left(x \right)} \cos{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 2 \log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cos{\left(x \right)} \cot^{4}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 4 \log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cos{\left(x \right)} \cot^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 2 \log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cos{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - \sin^{3}{\left(x \right)} \cot^{5}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \sin^{3}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - 3 \sin^{3}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} - \frac{\sin^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)}}{\cot{\left(x \right)}} + \sin^{2}{\left(x \right)} \cot^{5}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \sin^{2}{\left(x \right)} \cot^{3}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + 3 \sin^{2}{\left(x \right)} \cot{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)} + \frac{\sin^{2}{\left(x \right)} \cot^{\sin{\left(x \right)}}{\left(x \right)}}{\cot{\left(x \right)}}}{\left(\log{\left(\cot{\left(x \right)} \right)} \sin{\left(x \right)} \cot{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)} \cot^{2}{\left(x \right)} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)} - 2 \sin{\left(x \right)} \cot^{3}{\left(x \right)} - 2 \sin{\left(x \right)} \cot{\left(x \right)} + 2 \cos{\left(x \right)} \cot^{2}{\left(x \right)} + 2 \cos{\left(x \right)}\right) \cot{\left(x \right)}}\right)$$
=
$$\infty$$
Como puedes ver, hemos aplicado el método de l'Hopital (utilizando la derivada del numerador y denominador) 1 vez (veces)
Gráfica
Respuesta rápida [src]
oo
$$\infty$$
Otros límites con x→0, -oo, +oo, 1
$$\lim_{x \to 0^-}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right) = \infty$$
Más detalles con x→0 a la izquierda
$$\lim_{x \to 0^+}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right) = \infty$$
$$\lim_{x \to \infty}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right)$$
Más detalles con x→oo
$$\lim_{x \to 1^-}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right) = - \frac{\log{\left(\tan{\left(1 \right)} \right)} \cos{\left(1 \right)} \tan{\left(1 \right)} + \sin{\left(1 \right)} + \sin{\left(1 \right)} \tan^{2}{\left(1 \right)}}{\tan{\left(1 \right)} \tan^{\sin{\left(1 \right)}}{\left(1 \right)}}$$
Más detalles con x→1 a la izquierda
$$\lim_{x \to 1^+}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right) = - \frac{\log{\left(\tan{\left(1 \right)} \right)} \cos{\left(1 \right)} \tan{\left(1 \right)} + \sin{\left(1 \right)} + \sin{\left(1 \right)} \tan^{2}{\left(1 \right)}}{\tan{\left(1 \right)} \tan^{\sin{\left(1 \right)}}{\left(1 \right)}}$$
Más detalles con x→1 a la derecha
$$\lim_{x \to -\infty}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right)$$
Más detalles con x→-oo
A la izquierda y a la derecha [src]
     /             /                     /        2   \       \\
     |   sin(x)    |                     \-1 - cot (x)/*sin(x)||
 lim |cot      (x)*|cos(x)*log(cot(x)) + ---------------------||
x->0+\             \                             cot(x)       //
$$\lim_{x \to 0^+}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right)$$
oo
$$\infty$$
= 7.88658225034602
     /             /                     /        2   \       \\
     |   sin(x)    |                     \-1 - cot (x)/*sin(x)||
 lim |cot      (x)*|cos(x)*log(cot(x)) + ---------------------||
x->0-\             \                             cot(x)       //
$$\lim_{x \to 0^-}\left(\left(\frac{\left(- \cot^{2}{\left(x \right)} - 1\right) \sin{\left(x \right)}}{\cot{\left(x \right)}} + \log{\left(\cot{\left(x \right)} \right)} \cos{\left(x \right)}\right) \cot^{\sin{\left(x \right)}}{\left(x \right)}\right)$$
oo
$$\infty$$
= (7.85325563373746 + 3.07498909154237j)
= (7.85325563373746 + 3.07498909154237j)
Respuesta numérica [src]
7.88658225034602
7.88658225034602