| Exam Board | OCR |
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| Module | C4 (Core Mathematics 4) |
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| Topic | Implicit equations and differentiation |
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2. A curve has the equation
$$2 x ^ { 2 } + x y - y ^ { 2 } + 18 = 0$$
Find the coordinates of the points where the tangent to the curve is parallel to the \(x\)-axis.