$$\lim_{x \to \infty}\left(\frac{\csc^{2}{\left(x \right)} \csc^{2}{\left(x + 1 \right)}}{x^{3} \left(\csc^{2}{\left(x \right)} - \csc^{2}{\left(x + 1 \right)}\right)}\right)$$
$$\lim_{x \to 0^-}\left(\frac{\csc^{2}{\left(x \right)} \csc^{2}{\left(x + 1 \right)}}{x^{3} \left(\csc^{2}{\left(x \right)} - \csc^{2}{\left(x + 1 \right)}\right)}\right) = -\infty$$
Más detalles con x→0 a la izquierda$$\lim_{x \to 0^+}\left(\frac{\csc^{2}{\left(x \right)} \csc^{2}{\left(x + 1 \right)}}{x^{3} \left(\csc^{2}{\left(x \right)} - \csc^{2}{\left(x + 1 \right)}\right)}\right) = \infty$$
Más detalles con x→0 a la derecha$$\lim_{x \to 1^-}\left(\frac{\csc^{2}{\left(x \right)} \csc^{2}{\left(x + 1 \right)}}{x^{3} \left(\csc^{2}{\left(x \right)} - \csc^{2}{\left(x + 1 \right)}\right)}\right) = - \frac{1}{- \sin^{2}{\left(2 \right)} + \sin^{2}{\left(1 \right)}}$$
Más detalles con x→1 a la izquierda$$\lim_{x \to 1^+}\left(\frac{\csc^{2}{\left(x \right)} \csc^{2}{\left(x + 1 \right)}}{x^{3} \left(\csc^{2}{\left(x \right)} - \csc^{2}{\left(x + 1 \right)}\right)}\right) = - \frac{1}{- \sin^{2}{\left(2 \right)} + \sin^{2}{\left(1 \right)}}$$
Más detalles con x→1 a la derecha$$\lim_{x \to -\infty}\left(\frac{\csc^{2}{\left(x \right)} \csc^{2}{\left(x + 1 \right)}}{x^{3} \left(\csc^{2}{\left(x \right)} - \csc^{2}{\left(x + 1 \right)}\right)}\right)$$
Más detalles con x→-oo