Question
For the curve y = x^4 - 18x^2 + 5, dy/dx = 4x(x - 3)(x + 3) and the stationary points are at x = -3, x = 0 and x = 3.
[2 marks]
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Modelled on Cambridge 0606 · May/Jun 2025 · Paper 11 · Q6(b)(ii)
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