\[\boxed{\mathbf{1076}\mathbf{.}}\]
\[1)\ \frac{1 + \cos a + \cos{2a} + \cos{3a}}{\sin{2a} + 2\sin a\cos{2a}} =\]
\[= \text{ctg\ a}\]
\[2)\ \frac{1 - \sin a - \cos{2a} + \sin{3a}}{\sin{2a} + 2\cos a\cos{2a}} =\]
\[= \text{tg\ a\ }\]