| Exam Board | Edexcel |
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| Module | C2 (Core Mathematics 2) |
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| Year | 2013 |
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| Session | January |
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| Topic | Trig Equations |
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4. Solve, for \(0 \leqslant x < 180 ^ { \circ }\),
$$\cos \left( 3 x - 10 ^ { \circ } \right) = - 0.4$$
giving your answers to 1 decimal place. You should show each step in your working.