| Exam Board | OCR |
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| Module | C3 (Core Mathematics 3) |
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| Topic | Addition & Double Angle Formulae |
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4. Find the values of \(x\) in the interval \(- 180 < x < 180\) for which
$$\tan ( x + 45 ) ^ { \circ } - \tan x ^ { \circ } = 4 ,$$
giving your answers to 1 decimal place.