Answer
(a) See graph.
(b) function $y1$ has a period $\pi$ and function $y2$ has a period $2\pi$,
(c) $cos(sin(x))\gt sin(cos(x))$
Work Step by Step
(a) See the graphs of the two functions in the figure.
(b) Based on the graphs, function y1 has a period-1 of $\pi$ and function y2 has a period-2 of $2\pi$
(c) From the graph, it can be seen that the red curve is always above the purple curve meaning $y1\gt y2$ which gives the inequality $cos(sin(x))\gt sin(cos(x))$
