| Exam Board | OCR |
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| Module | H240/02 (Pure Mathematics and Statistics) |
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| Year | 2020 |
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| Session | November |
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| Topic | Trig Equations |
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4 In this question you must show detailed reasoning.
Solve the equation \(3 \sin ^ { 4 } \phi + \sin ^ { 2 } \phi = 4\), for \(0 \leqslant \phi < 2 \pi\), where \(\phi\) is measured in radians.