\[\boxed{\mathbf{1472}\mathbf{.}}\]
\[1)\ y = x \bullet \sin x;\]
\[y( - x) = - x \bullet \sin( - x) =\]
\[= - x \bullet \left( - \sin x \right) =\]
\[= x \bullet \sin x = y(x);\]
\[Ответ:\ \ четная.\]
\[2)\ y = x^{2} \bullet \cos{2x};\]
\[y( - x) = ( - x)^{2} \bullet \cos\left( 2 \bullet ( - x) \right) =\]
\[= x^{2} \bullet \cos( - 2x) =\]
\[= x^{2} \bullet \cos{2x} = y(x);\]
\[Ответ:\ \ четная.\]
\[3)\ y = x + \sin x;\]
\[y( - x) = - x + \sin( - x) =\]
\[= - x - \sin x = - y(x);\]
\[Ответ:\ \ нечетная.\]
\[4)\ y = x + \cos x;\]
\[y( - x) = - x + \cos( - x) =\]
\[= - x + \cos x;\]
\[Ответ:\ \ ни\ четная,\ ни\ нечетная.\]