| 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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4. A curve has the equation
$$4 x ^ { 2 } - 2 x y - y ^ { 2 } + 11 = 0$$
Find an equation for the normal to the curve at the point with coordinates \(( - 1 , - 3 )\).