Calcola i valori delle seguenti espressioni, utilizzando le informazioni indicate a fianco.
$$
\begin{aligned}
& 420 \cos \left(270^{\circ}-\alpha\right)-\cos \left(180^{\circ}-\alpha\right)+\tan \left(90^{\circ}+\alpha\right) ; \quad \cos \alpha=-\frac{4}{5}, \operatorname{con} \pi<\alpha<\frac{3}{2} \pi \\
& 421 \frac{\sin \left(\frac{\pi}{2}-\alpha\right)+2 \cos (-\alpha)}{\sin (-\pi-\alpha)}+\tan \left(\frac{3}{2} \pi-\alpha\right) ; \quad \sin \alpha=\frac{12}{13}, \operatorname{con} \frac{\pi}{2}<\alpha<\pi
\end{aligned}
$$
