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Límite de la función sin(5*x)^2*(1+x^3-6*x)/((4+x^2)*asin(x^2+3*x)*tan(12*x))

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Solución

Ha introducido [src]
     /        2      /     3      \    \
     |     sin (5*x)*\1 + x  - 6*x/    |
 lim |---------------------------------|
x->0+|/     2\     / 2      \          |
     \\4 + x /*asin\x  + 3*x/*tan(12*x)/
$$\lim_{x \to 0^+}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right)$$
Limit((sin(5*x)^2*(1 + x^3 - 6*x))/((((4 + x^2)*asin(x^2 + 3*x))*tan(12*x))), x, 0)
Método de l'Hopital
Tenemos la indeterminación de tipo
0/0,

tal que el límite para el numerador es
$$\lim_{x \to 0^+}\left(\frac{\left(x^{3} - 6 x + 1\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \tan{\left(12 x \right)}}\right) = 0$$
y el límite para el denominador es
$$\lim_{x \to 0^+} \operatorname{asin}{\left(x \left(x + 3\right) \right)} = 0$$
Vamos a probar las derivadas del numerador y denominador hasta eliminar la indeterminación.
$$\lim_{x \to 0^+}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right)$$
=
Introducimos una pequeña modificación de la función bajo el signo del límite
$$\lim_{x \to 0^+}\left(\frac{\left(x^{3} - 6 x + 1\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \tan{\left(12 x \right)} \operatorname{asin}{\left(x \left(x + 3\right) \right)}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{\frac{d}{d x} \frac{\left(x^{3} - 6 x + 1\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \tan{\left(12 x \right)}}}{\frac{d}{d x} \operatorname{asin}{\left(x \left(x + 3\right) \right)}}\right)$$
=
$$\lim_{x \to 0^+}\left(\frac{\sqrt{- x^{2} \left(x + 3\right)^{2} + 1} \left(- \frac{2 x \left(x^{3} - 6 x + 1\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right)^{2} \tan{\left(12 x \right)}} + \frac{\left(3 x^{2} - 6\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \tan{\left(12 x \right)}} + \frac{\left(- 12 \tan^{2}{\left(12 x \right)} - 12\right) \left(x^{3} - 6 x + 1\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \tan^{2}{\left(12 x \right)}} + \frac{10 \left(x^{3} - 6 x + 1\right) \sin{\left(5 x \right)} \cos{\left(5 x \right)}}{\left(x^{2} + 4\right) \tan{\left(12 x \right)}}\right)}{2 x + 3}\right)$$
=
$$\lim_{x \to 0^+}\left(- \frac{2 x^{4} \sin^{2}{\left(5 x \right)}}{3 x^{4} \tan{\left(12 x \right)} + 24 x^{2} \tan{\left(12 x \right)} + 48 \tan{\left(12 x \right)}} - \frac{12 x^{3} \sin^{2}{\left(5 x \right)} \tan^{2}{\left(12 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{12 x^{3} \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} + \frac{10 x^{3} \sin{\left(5 x \right)} \cos{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} + \frac{12 x^{2} \sin^{2}{\left(5 x \right)}}{3 x^{4} \tan{\left(12 x \right)} + 24 x^{2} \tan{\left(12 x \right)} + 48 \tan{\left(12 x \right)}} + \frac{3 x^{2} \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} - \frac{2 x \sin^{2}{\left(5 x \right)}}{3 x^{4} \tan{\left(12 x \right)} + 24 x^{2} \tan{\left(12 x \right)} + 48 \tan{\left(12 x \right)}} + \frac{72 x \sin^{2}{\left(5 x \right)} \tan^{2}{\left(12 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} + \frac{72 x \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{60 x \sin{\left(5 x \right)} \cos{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} - \frac{12 \sin^{2}{\left(5 x \right)} \tan^{2}{\left(12 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{12 \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{6 \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} + \frac{10 \sin{\left(5 x \right)} \cos{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}}\right)$$
=
$$\lim_{x \to 0^+}\left(- \frac{2 x^{4} \sin^{2}{\left(5 x \right)}}{3 x^{4} \tan{\left(12 x \right)} + 24 x^{2} \tan{\left(12 x \right)} + 48 \tan{\left(12 x \right)}} - \frac{12 x^{3} \sin^{2}{\left(5 x \right)} \tan^{2}{\left(12 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{12 x^{3} \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} + \frac{10 x^{3} \sin{\left(5 x \right)} \cos{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} + \frac{12 x^{2} \sin^{2}{\left(5 x \right)}}{3 x^{4} \tan{\left(12 x \right)} + 24 x^{2} \tan{\left(12 x \right)} + 48 \tan{\left(12 x \right)}} + \frac{3 x^{2} \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} - \frac{2 x \sin^{2}{\left(5 x \right)}}{3 x^{4} \tan{\left(12 x \right)} + 24 x^{2} \tan{\left(12 x \right)} + 48 \tan{\left(12 x \right)}} + \frac{72 x \sin^{2}{\left(5 x \right)} \tan^{2}{\left(12 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} + \frac{72 x \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{60 x \sin{\left(5 x \right)} \cos{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} - \frac{12 \sin^{2}{\left(5 x \right)} \tan^{2}{\left(12 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{12 \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan^{2}{\left(12 x \right)} + 12 \tan^{2}{\left(12 x \right)}} - \frac{6 \sin^{2}{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}} + \frac{10 \sin{\left(5 x \right)} \cos{\left(5 x \right)}}{3 x^{2} \tan{\left(12 x \right)} + 12 \tan{\left(12 x \right)}}\right)$$
=
$$\frac{25}{144}$$
Como puedes ver, hemos aplicado el método de l'Hopital (utilizando la derivada del numerador y denominador) 1 vez (veces)
Gráfica
Respuesta rápida [src]
 25
---
144
$$\frac{25}{144}$$
A la izquierda y a la derecha [src]
     /        2      /     3      \    \
     |     sin (5*x)*\1 + x  - 6*x/    |
 lim |---------------------------------|
x->0+|/     2\     / 2      \          |
     \\4 + x /*asin\x  + 3*x/*tan(12*x)/
$$\lim_{x \to 0^+}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right)$$
 25
---
144
$$\frac{25}{144}$$
= 0.173611111111111
     /        2      /     3      \    \
     |     sin (5*x)*\1 + x  - 6*x/    |
 lim |---------------------------------|
x->0-|/     2\     / 2      \          |
     \\4 + x /*asin\x  + 3*x/*tan(12*x)/
$$\lim_{x \to 0^-}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right)$$
 25
---
144
$$\frac{25}{144}$$
= 0.173611111111111
= 0.173611111111111
Otros límites con x→0, -oo, +oo, 1
$$\lim_{x \to 0^-}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right) = \frac{25}{144}$$
Más detalles con x→0 a la izquierda
$$\lim_{x \to 0^+}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right) = \frac{25}{144}$$
$$\lim_{x \to \infty}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right)$$
Más detalles con x→oo
$$\lim_{x \to 1^-}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right) = - \frac{4 \sin^{2}{\left(5 \right)}}{5 \tan{\left(12 \right)} \operatorname{asin}{\left(4 \right)}}$$
Más detalles con x→1 a la izquierda
$$\lim_{x \to 1^+}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right) = - \frac{4 \sin^{2}{\left(5 \right)}}{5 \tan{\left(12 \right)} \operatorname{asin}{\left(4 \right)}}$$
Más detalles con x→1 a la derecha
$$\lim_{x \to -\infty}\left(\frac{\left(- 6 x + \left(x^{3} + 1\right)\right) \sin^{2}{\left(5 x \right)}}{\left(x^{2} + 4\right) \operatorname{asin}{\left(x^{2} + 3 x \right)} \tan{\left(12 x \right)}}\right)$$
Más detalles con x→-oo
Respuesta numérica [src]
0.173611111111111
0.173611111111111