\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let \(f(x) = 2x^4 - 8x^3 + 12x^2 + 3\).
  1. Show that \(f''(x)=24(x-1)^2\).
  2. Hence, determine the concavity of the graph of \(y=f(x)\).

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