$$\lim_{z \to 0^-}\left(z^{3} \sin{\left(\frac{3}{z} \right)}\right) = 0$$
More at z→0 from the left$$\lim_{z \to 0^+}\left(z^{3} \sin{\left(\frac{3}{z} \right)}\right) = 0$$
$$\lim_{z \to \infty}\left(z^{3} \sin{\left(\frac{3}{z} \right)}\right) = \infty$$
More at z→oo$$\lim_{z \to 1^-}\left(z^{3} \sin{\left(\frac{3}{z} \right)}\right) = \sin{\left(3 \right)}$$
More at z→1 from the left$$\lim_{z \to 1^+}\left(z^{3} \sin{\left(\frac{3}{z} \right)}\right) = \sin{\left(3 \right)}$$
More at z→1 from the right$$\lim_{z \to -\infty}\left(z^{3} \sin{\left(\frac{3}{z} \right)}\right) = \infty$$
More at z→-oo