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Question 85

Given that θ \theta\,θ is small and is measured in radians, use the small angle approximations to verify that

5θtan⁡2θcos⁡4θ−1≈−54 \frac{5\theta \tan 2\theta}{\cos 4\theta - 1} \approx -\frac{5}{4} cos4θ−15θtan2θ​≈−45​

Verify the stated approximation.

[3]
Markscheme

Radians Questions

  1. A Level
  2. /Maths
  3. /Radians

278 exam-style questions on Edexcel A Level Maths Radians, covering 5.1 Radian Measure, 5.2 Arc Length, 5.3 Areas of Sectors and Segments, 5.4 Solving Trigonometric Equations, and 5.5 Small Angle Approximations. Each one has a worked solution and a mark scheme showing where the marks go.

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