$$
\begin{array}{l}
\text { 2. In } \triangle A B C \text {, } \angle C-45^{\circ} \text {, and } \\
\frac{\sin A+\sin B+\sin C}{\cos A+\cos B+\cos C}=\sqrt{3} \text {. }
\end{array}
$$

Then the degree measure of the largest interior angle is