\[1)\ y = \sin x + tg\ x\]
\[x \neq \frac{\pi}{2} + \pi n;\]
\[y( - x) = \sin( - x) + tg( - x) =\]
\[= - \sin x - tg\ x = - y(x).\]
\[Ответ:\ \ нечетная.\]
\[2)\ y = \sin x \cdot tg\ x\]
\[x \neq \frac{\pi}{2} + \pi n;\]
\[y( - x) = \sin( - x) \cdot tg( - x) =\]
\[= \sin x \cdot tg\ x = y(x).\]
\[Ответ:\ \ четная.\]
\[3)\ y = \sin x\left| \cos x \right|\]
\[x \in R;\]
\[y( - x) = \sin( - x) \cdot \left| \cos( - x) \right| =\]
\[= - \sin x \cdot \left| \cos x \right| = - y(x).\]
\[Ответ:\ \ нечетная.\]