| Exam Board | Edexcel |
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| Module | AEA (Advanced Extension Award) |
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| Year | 2015 |
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| Session | June |
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| Topic | Reciprocal Trig & Identities |
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3．Solve for \(0 < x < 360 ^ { \circ }\)
$$\cot 2 x - \tan 78 ^ { \circ } = \frac { ( \sec x ) \left( \sec 78 ^ { \circ } \right) } { 2 }$$
where \(x\) is not an integer multiple of \(90 ^ { \circ }\)