2000005406

Functions $f(x)=\cos (x+\frac{\pi }{6})$ and $g(x)=\sin (x-\frac{\pi }{6})$ are equal.

Functions $f(x)=2-\cos 3x$ is even and its range of values is $[1;3]$.

Functions $f(x)=\cos (x-\frac{\pi }{3})$ and $g(x)=\sin (x+\frac{\pi }{6})$ are equal.

Functions $f(x)=\cos x$ and $g(x)=\sin (x+\frac{\pi }{2})$ are equal.