Radians are essential
Radians are essential
A small angle approximation replaces a trigonometric function with a simpler algebraic expression when the angle is close to zero. The angle must be measured in radians, because the standard approximations depend on radian measure.
Step-by-step lessons on AQA A Level Maths 1.8.2 Small angle approximations (A-level only). Each one builds up to exam-style questions. Build fluency with the core pure algebra and calculus toolkit early, since almost every mechanics and statistics topic on the course depends on it.