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)