Find the interval or intervals where the function is increasing and where it is decreasing.  Please put it in this format, Increasing : (−∞,1) and (3,∞), Decreasing : (1,3) and please show the solutions. 1. y = x³ - 4x² + 4x  2. y = 8x³ - 9x² + 1  3. y = x⁴ 4. y = 4x⁻¹ + x

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