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Límite de la función log(1+x)/(asin(77*sqrt(x))*sqrt(tan(70*x)))

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Solución

Ha introducido [src]
     /         log(1 + x)         \
 lim |----------------------------|
x->0+|    /     ___\   ___________|
     \asin\77*\/ x /*\/ tan(70*x) /
$$\lim_{x \to 0^+}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
Limit(log(1 + x)/((asin(77*sqrt(x))*sqrt(tan(70*x)))), x, 0)
Método de l'Hopital
Tenemos la indeterminación de tipo
0/0,

tal que el límite para el numerador es
$$\lim_{x \to 0^+}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}}}\right) = 0$$
y el límite para el denominador es
$$\lim_{x \to 0^+} \operatorname{asin}{\left(77 \sqrt{x} \right)} = 0$$
Vamos a probar las derivadas del numerador y denominador hasta eliminar la indeterminación.
$$\lim_{x \to 0^+}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
=
Introducimos una pequeña modificación de la función bajo el signo del límite
$$\lim_{x \to 0^+}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{\frac{d}{d x} \frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}}}}{\frac{d}{d x} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{2 \sqrt{x} \sqrt{1 - 5929 x} \left(\frac{\left(- 35 \tan^{2}{\left(70 x \right)} - 35\right) \log{\left(x + 1 \right)}}{\tan^{\frac{3}{2}}{\left(70 x \right)}} + \frac{1}{\left(x + 1\right) \sqrt{\tan{\left(70 x \right)}}}\right)}{77}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{2 \sqrt{x} \left(\frac{\left(- 35 \tan^{2}{\left(70 x \right)} - 35\right) \log{\left(x + 1 \right)}}{\tan^{\frac{3}{2}}{\left(70 x \right)}} + \frac{1}{\left(x + 1\right) \sqrt{\tan{\left(70 x \right)}}}\right)}{77}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{\frac{d}{d x} \frac{2 \sqrt{x}}{77}}{\frac{d}{d x} \frac{1}{\frac{\left(- 35 \tan^{2}{\left(70 x \right)} - 35\right) \log{\left(x + 1 \right)}}{\tan^{\frac{3}{2}}{\left(70 x \right)}} + \frac{1}{\left(x + 1\right) \sqrt{\tan{\left(70 x \right)}}}}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{1225 \log{\left(x + 1 \right)}^{2} \tan{\left(70 x \right)} + \frac{2450 \log{\left(x + 1 \right)}^{2}}{\tan{\left(70 x \right)}} + \frac{1225 \log{\left(x + 1 \right)}^{2}}{\tan^{3}{\left(70 x \right)}} + \frac{1}{x^{2} \tan{\left(70 x \right)} + 2 x \tan{\left(70 x \right)} + \tan{\left(70 x \right)}} - \frac{70 \log{\left(x + 1 \right)} \tan^{2}{\left(70 x \right)}}{x \tan^{2}{\left(70 x \right)} + \tan^{2}{\left(70 x \right)}} - \frac{70 \log{\left(x + 1 \right)}}{x \tan^{2}{\left(70 x \right)} + \tan^{2}{\left(70 x \right)}}}{77 \sqrt{x} \left(1225 \log{\left(x + 1 \right)} \tan^{\frac{3}{2}}{\left(70 x \right)} - \frac{2450 \log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}}} - \frac{3675 \log{\left(x + 1 \right)}}{\tan^{\frac{5}{2}}{\left(70 x \right)}} + \frac{1}{x^{2} \sqrt{\tan{\left(70 x \right)}} + 2 x \sqrt{\tan{\left(70 x \right)}} + \sqrt{\tan{\left(70 x \right)}}} + \frac{70 \tan^{2}{\left(70 x \right)}}{x \tan^{\frac{3}{2}}{\left(70 x \right)} + \tan^{\frac{3}{2}}{\left(70 x \right)}} + \frac{70}{x \tan^{\frac{3}{2}}{\left(70 x \right)} + \tan^{\frac{3}{2}}{\left(70 x \right)}}\right)}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{1225 \log{\left(x + 1 \right)}^{2} \tan{\left(70 x \right)} + \frac{2450 \log{\left(x + 1 \right)}^{2}}{\tan{\left(70 x \right)}} + \frac{1225 \log{\left(x + 1 \right)}^{2}}{\tan^{3}{\left(70 x \right)}} + \frac{1}{x^{2} \tan{\left(70 x \right)} + 2 x \tan{\left(70 x \right)} + \tan{\left(70 x \right)}} - \frac{70 \log{\left(x + 1 \right)} \tan^{2}{\left(70 x \right)}}{x \tan^{2}{\left(70 x \right)} + \tan^{2}{\left(70 x \right)}} - \frac{70 \log{\left(x + 1 \right)}}{x \tan^{2}{\left(70 x \right)} + \tan^{2}{\left(70 x \right)}}}{77 \sqrt{x} \left(1225 \log{\left(x + 1 \right)} \tan^{\frac{3}{2}}{\left(70 x \right)} - \frac{2450 \log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}}} - \frac{3675 \log{\left(x + 1 \right)}}{\tan^{\frac{5}{2}}{\left(70 x \right)}} + \frac{1}{x^{2} \sqrt{\tan{\left(70 x \right)}} + 2 x \sqrt{\tan{\left(70 x \right)}} + \sqrt{\tan{\left(70 x \right)}}} + \frac{70 \tan^{2}{\left(70 x \right)}}{x \tan^{\frac{3}{2}}{\left(70 x \right)} + \tan^{\frac{3}{2}}{\left(70 x \right)}} + \frac{70}{x \tan^{\frac{3}{2}}{\left(70 x \right)} + \tan^{\frac{3}{2}}{\left(70 x \right)}}\right)}\right)$$
=
$$\frac{\sqrt{70}}{5390}$$
Como puedes ver, hemos aplicado el método de l'Hopital (utilizando la derivada del numerador y denominador) 2 vez (veces)
Gráfica
Otros límites con x→0, -oo, +oo, 1
$$\lim_{x \to 0^-}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right) = \frac{\sqrt{70}}{5390}$$
Más detalles con x→0 a la izquierda
$$\lim_{x \to 0^+}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right) = \frac{\sqrt{70}}{5390}$$
$$\lim_{x \to \infty}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
Más detalles con x→oo
$$\lim_{x \to 1^-}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right) = \frac{\log{\left(2 \right)}}{\sqrt{\tan{\left(70 \right)}} \operatorname{asin}{\left(77 \right)}}$$
Más detalles con x→1 a la izquierda
$$\lim_{x \to 1^+}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right) = \frac{\log{\left(2 \right)}}{\sqrt{\tan{\left(70 \right)}} \operatorname{asin}{\left(77 \right)}}$$
Más detalles con x→1 a la derecha
$$\lim_{x \to -\infty}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
Más detalles con x→-oo
A la izquierda y a la derecha [src]
     /         log(1 + x)         \
 lim |----------------------------|
x->0+|    /     ___\   ___________|
     \asin\77*\/ x /*\/ tan(70*x) /
$$\lim_{x \to 0^+}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
  ____
\/ 70 
------
 5390 
$$\frac{\sqrt{70}}{5390}$$
= (0.00166124896756775 + 0.0026671040065283j)
     /         log(1 + x)         \
 lim |----------------------------|
x->0-|    /     ___\   ___________|
     \asin\77*\/ x /*\/ tan(70*x) /
$$\lim_{x \to 0^-}\left(\frac{\log{\left(x + 1 \right)}}{\sqrt{\tan{\left(70 x \right)}} \operatorname{asin}{\left(77 \sqrt{x} \right)}}\right)$$
  ____
\/ 70 
------
 5390 
$$\frac{\sqrt{70}}{5390}$$
= (0.0018849187901852 + 2.21039773206639e-7j)
= (0.0018849187901852 + 2.21039773206639e-7j)
Respuesta rápida [src]
  ____
\/ 70 
------
 5390 
$$\frac{\sqrt{70}}{5390}$$
Respuesta numérica [src]
(0.00166124896756775 + 0.0026671040065283j)
(0.00166124896756775 + 0.0026671040065283j)