| Exam Board | Edexcel |
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| Module | PMT Mocks (PMT Mocks) |
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| Topic | Reciprocal Trig & Identities |
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12. a. Show that
$$\sec \theta - \cos \theta = \sin \theta \tan \theta \quad \theta \neq ( \pi n ) ^ { 0 } \quad n \in Z$$
b. Hence, or otherwise, solve for \(0 < x \leq \pi\)
$$\sec x - \cos x = \sin x \tan \left( 3 x - \frac { \pi } { 9 } \right)$$