| Exam Board | OCR |
|---|
| Module | H240/03 (Pure Mathematics and Mechanics) |
|---|
| Topic | Small angle approximation |
|---|
4 For a small angle \(\theta\), where \(\theta\) is in radians, show that \(1 + \cos \theta - 3 \cos ^ { 2 } \theta \approx - 1 + \frac { 5 } { 2 } \theta ^ { 2 }\).