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Give the monic representative of each polynomial in \(\mathbb{R}[X]\).
  1. \(P_1 = 2 X^3 - 4 X^2 + 6 X\).
  2. \(P_2 = -X^4 + 2 X^2 - 1\).
  3. \(P_3 = \frac{1}{2}(X^2 - 9)\).
  4. \(P_4 = (3 X - 1)(2 X + 4)\).

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