The function y = f(x) is represented parametrically by x = t5 – 5t3 – 20t + 7 and y = 4t3 – 3t2 – 18t + 3 (-2 < t < 2). At which point does y = f(x) has a minimum value?

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The function y = f(x) is represented parametrically by x = t<sup>5</sup> – 5t<sup>3</sup> – 20t + 7 and y = 4t<sup>3</sup> – 3t<sup>2</sup> – 18t + 3 (-2 < t < 2). At which point does y = f(x) has a minimum value?