\[\mathsf{Q}^{-\mu}_{\nu}\left(\cos\theta\right)=-\frac{\pi}{2\nu^{\mu}}\left(%
\frac{\theta}{\sin\theta}\right)^{1/2}\left(Y_{\mu}\left(\left(\nu+\tfrac{1}{2%
}\right)\theta\right)+O\left(\frac{1}{\nu}\right)\operatorname{env}\mskip-2.0%
muY_{\mu}\left(\left(\nu+\tfrac{1}{2}\right)\theta\right)\right),\]