| Exam Board | OCR |
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| Module | C4 (Core Mathematics 4) |
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| Year | 2012 |
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| Session | June |
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| Topic | Differential equations |
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4 Solve the differential equation
$$\mathrm { e } ^ { 2 y } \frac { \mathrm {~d} y } { \mathrm {~d} x } + \tan x = 0 ,$$
given that \(x = 0\) when \(y = 0\). Give your answer in the form \(y = \mathrm { f } ( x )\).