\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Below is an accurate graph of the function \( y = \sin(x) \), for \( 0 \leq x \leq 4\pi \).
  1. Find the \(y\)-intercept of the graph.
  2. Find the values of \(x\) on \(0 \le x \le 4\pi\) for which:
    1. \(\sin x = 1\)
    2. \(\sin x = 0\)
  3. Find the intervals on \(0 \le x \le 4\pi\) where \(\sin x\) is:
    1. non-negative
    2. non-positive.
  4. Find the range of the function.

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