| Exam Board | Edexcel |
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| Module | C3 (Core Mathematics 3) |
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| Year | 2009 |
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| Session | January |
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| Topic | Implicit equations and differentiation |
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4. Find the equation of the tangent to the curve \(x = \cos ( 2 y + \pi )\) at \(\left( 0 , \frac { \pi } { 4 } \right)\).
Give your answer in the form \(y = a x + b\), where \(a\) and \(b\) are constants to be found.