| Exam Board | OCR |
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| Module | Further Additional Pure AS (Further Additional Pure AS) |
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| Year | 2023 |
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| Session | June |
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| Topic | Differentiation Applications |
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| Type | Find stationary points |
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3 A surface has equation \(z = x ^ { 2 } y ^ { 2 } - 3 x y + 2 x + y\) for all real values of \(x\) and \(y\). Determine the coordinates of all stationary points of this surface.