8. If $\mathrm{P}(\sin \alpha, \cos \alpha)$ is a point on the terminal side of angle $\beta$, then $\sin \beta=$ $\qquad$ , $\operatorname{tg} \beta=$ $\qquad$
$8 . \cos \alpha, \operatorname{ctg} \alpha$.

$8 . \cos \alpha, \cot \alpha$.