use a graphing utility to graph the function. (Include two full periods.) Be sure to choose an

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use a graphing utility to graph the function. (Include two full periods.) Be sure to choose an appropriate viewing window.
1. y = -2 sin (4x + π)
2. y = -4 sin (2/3 x - π/3)
3. y = cos ( 2πx - π/2) + 1
4. y = 3 cos (πx/2 + π/2) - 2
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