\[\boxed{\mathbf{706}\mathbf{.}}\]
\[1)\ y = \sin x + \cos x\]
\[y(x + T) = y(x)\]
\[\sin(x + T) + \cos(x + T) =\]
\[= \sin x + \cos x\]
\[T = 2\pi.\]
\[Ответ:\ \ 2\pi.\]
\[2)\ y = \sin x + tg\ x\]
\[y(x + T) = y(x)\]
\[\sin(x + T) + tg(x + T) =\]
\[= \sin x + tg\ x\]
\[T = 2\pi\ или\ T = \pi.\]
\[Ответ:\ \ 2\pi.\]