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Límite de la función (-1+e^((2+x)/(-1+2*x^2)))*sin((2+pi*x)/(-7+6*x))/asin(1/(1+8*x))

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Ha introducido [src]
     //        2 + x  \              \
     ||      ---------|              |
     ||              2|              |
     ||      -1 + 2*x |    /2 + pi*x\|
     |\-1 + E         /*sin|--------||
     |                     \-7 + 6*x/|
 lim |-------------------------------|
x->oo|             /   1   \         |
     |         asin|-------|         |
     \             \1 + 8*x/         /
$$\lim_{x \to \infty}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right)$$
Limit(((-1 + E^((2 + x)/(-1 + 2*x^2)))*sin((2 + pi*x)/(-7 + 6*x)))/asin(1/(1 + 8*x)), x, oo, dir='-')
Método de l'Hopital
Tenemos la indeterminación de tipo
oo/oo,

tal que el límite para el numerador es
$$\lim_{x \to \infty}\left(\frac{\sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right) = \infty$$
y el límite para el denominador es
$$\lim_{x \to \infty} \frac{1}{e^{\frac{x + 2}{2 x^{2} - 1}} - 1} = \infty$$
Vamos a probar las derivadas del numerador y denominador hasta eliminar la indeterminación.
$$\lim_{x \to \infty}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right)$$
=
Introducimos una pequeña modificación de la función bajo el signo del límite
$$\lim_{x \to \infty}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right)$$
=
$$\lim_{x \to \infty}\left(\frac{\frac{d}{d x} \frac{\sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}}{\frac{d}{d x} \frac{1}{e^{\frac{x + 2}{2 x^{2} - 1}} - 1}}\right)$$
=
$$\lim_{x \to \infty}\left(- \frac{\left(\frac{\left(\frac{\pi}{6 x - 7} - \frac{6 \left(\pi x + 2\right)}{\left(6 x - 7\right)^{2}}\right) \cos{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}} + \frac{8 \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\sqrt{1 - \frac{1}{\left(8 x + 1\right)^{2}}} \left(8 x + 1\right)^{2} \operatorname{asin}^{2}{\left(\frac{1}{8 x + 1} \right)}}\right) \left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right)^{2} e^{- \frac{x + 2}{2 x^{2} - 1}}}{- \frac{4 x \left(x + 2\right)}{\left(2 x^{2} - 1\right)^{2}} + \frac{1}{2 x^{2} - 1}}\right)$$
=
$$\lim_{x \to \infty}\left(\frac{- \frac{6 \pi x \cos{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{36 x^{2} \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} - 84 x \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} + 49 \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}} + \frac{8 \sin{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{64 x^{2} \sqrt{1 - \frac{1}{64 x^{2} + 16 x + 1}} \operatorname{asin}^{2}{\left(\frac{1}{8 x + 1} \right)} + 16 x \sqrt{1 - \frac{1}{64 x^{2} + 16 x + 1}} \operatorname{asin}^{2}{\left(\frac{1}{8 x + 1} \right)} + \sqrt{1 - \frac{1}{64 x^{2} + 16 x + 1}} \operatorname{asin}^{2}{\left(\frac{1}{8 x + 1} \right)}} - \frac{12 \cos{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{36 x^{2} \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} - 84 x \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} + 49 \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}} + \frac{\pi \cos{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{6 x \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} - 7 \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}}{\frac{4 x^{2}}{4 x^{4} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 8 x^{4} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 4 x^{4} - 4 x^{2} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} + 8 x^{2} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} - 4 x^{2} + e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 2 e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 1} + \frac{8 x}{4 x^{4} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 8 x^{4} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 4 x^{4} - 4 x^{2} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} + 8 x^{2} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} - 4 x^{2} + e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 2 e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 1} - \frac{1}{2 x^{2} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 4 x^{2} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 2 x^{2} - e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} + 2 e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} - 1}}\right)$$
=
$$\lim_{x \to \infty}\left(\frac{- \frac{6 \pi x \cos{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{36 x^{2} \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} - 84 x \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} + 49 \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}} + \frac{8 \sin{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{64 x^{2} \sqrt{1 - \frac{1}{64 x^{2} + 16 x + 1}} \operatorname{asin}^{2}{\left(\frac{1}{8 x + 1} \right)} + 16 x \sqrt{1 - \frac{1}{64 x^{2} + 16 x + 1}} \operatorname{asin}^{2}{\left(\frac{1}{8 x + 1} \right)} + \sqrt{1 - \frac{1}{64 x^{2} + 16 x + 1}} \operatorname{asin}^{2}{\left(\frac{1}{8 x + 1} \right)}} - \frac{12 \cos{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{36 x^{2} \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} - 84 x \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} + 49 \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}} + \frac{\pi \cos{\left(\frac{\pi x}{6 x - 7} + \frac{2}{6 x - 7} \right)}}{6 x \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)} - 7 \operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}}{\frac{4 x^{2}}{4 x^{4} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 8 x^{4} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 4 x^{4} - 4 x^{2} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} + 8 x^{2} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} - 4 x^{2} + e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 2 e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 1} + \frac{8 x}{4 x^{4} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 8 x^{4} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 4 x^{4} - 4 x^{2} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} + 8 x^{2} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} - 4 x^{2} + e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 2 e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 1} - \frac{1}{2 x^{2} e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} - 4 x^{2} e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} + 2 x^{2} - e^{\frac{2 x}{2 x^{2} - 1}} e^{\frac{4}{2 x^{2} - 1}} + 2 e^{\frac{x}{2 x^{2} - 1}} e^{\frac{2}{2 x^{2} - 1}} - 1}}\right)$$
=
$$2$$
Como puedes ver, hemos aplicado el método de l'Hopital (utilizando la derivada del numerador y denominador) 1 vez (veces)
Gráfica
Respuesta rápida [src]
2
$$2$$
Otros límites con x→0, -oo, +oo, 1
$$\lim_{x \to \infty}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right) = 2$$
$$\lim_{x \to 0^-}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right) = \frac{2 \left(-1 + e^{2}\right) \sin{\left(\frac{2}{7} \right)}}{\pi e^{2}}$$
Más detalles con x→0 a la izquierda
$$\lim_{x \to 0^+}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right) = \frac{2 \left(-1 + e^{2}\right) \sin{\left(\frac{2}{7} \right)}}{\pi e^{2}}$$
Más detalles con x→0 a la derecha
$$\lim_{x \to 1^-}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right) = \frac{- \sin{\left(2 \right)} + e^{3} \sin{\left(2 \right)}}{\operatorname{asin}{\left(\frac{1}{9} \right)}}$$
Más detalles con x→1 a la izquierda
$$\lim_{x \to 1^+}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right) = \frac{- \sin{\left(2 \right)} + e^{3} \sin{\left(2 \right)}}{\operatorname{asin}{\left(\frac{1}{9} \right)}}$$
Más detalles con x→1 a la derecha
$$\lim_{x \to -\infty}\left(\frac{\left(e^{\frac{x + 2}{2 x^{2} - 1}} - 1\right) \sin{\left(\frac{\pi x + 2}{6 x - 7} \right)}}{\operatorname{asin}{\left(\frac{1}{8 x + 1} \right)}}\right) = 2$$
Más detalles con x→-oo