Tomamos como el límite
$$\lim_{x \to 1^+}\left(\frac{x^{13}}{\left(x^{5} + \left(x^{3} + 1\right)\right)^{3}}\right)$$
cambiamos
$$\lim_{x \to 1^+}\left(\frac{x^{13}}{\left(x^{5} + \left(x^{3} + 1\right)\right)^{3}}\right)$$
=
$$\lim_{x \to 1^+}\left(\frac{x^{13}}{\left(x^{5} + x^{3} + 1\right)^{3}}\right)$$
=
$$\lim_{x \to 1^+}\left(\frac{x^{13}}{\left(x^{5} + x^{3} + 1\right)^{3}}\right) = $$
$$\frac{1^{13}}{\left(1 + 1^{3} + 1^{5}\right)^{3}} = $$
= 1/27
Entonces la respuesta definitiva es:
$$\lim_{x \to 1^+}\left(\frac{x^{13}}{\left(x^{5} + \left(x^{3} + 1\right)\right)^{3}}\right) = \frac{1}{27}$$