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Límite de la función atan(pi/(3+3*x))^(1+x)*atan(pi/(3*x))^(-x)

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Solución

Ha introducido [src]
     /    1 + x/   pi  \     -x/ pi\\
 lim |atan     |-------|*atan  |---||
x->oo\         \3 + 3*x/       \3*x//
$$\lim_{x \to \infty}\left(\operatorname{atan}^{- x}{\left(\frac{\pi}{3 x} \right)} \operatorname{atan}^{x + 1}{\left(\frac{\pi}{3 x + 3} \right)}\right)$$
Limit(atan(pi/(3 + 3*x))^(1 + x)*atan(pi/((3*x)))^(-x), x, oo, dir='-')
Método de l'Hopital
Tenemos la indeterminación de tipo
oo/oo,

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