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Question 97
a.

Prove the identity 3sin⁡2x1+cot⁡2x≡6sin⁡3xcos⁡x\displaystyle \frac{3\sin 2x}{1 + \cot^2 x} \equiv 6 \sin^3 x \cos x1+cot2x3sin2x​≡6sin3xcosx

[3]
b.

Hence, find ∫12sin⁡4θ1+cot⁡22θdθ\displaystyle \int \frac{12 \sin 4\theta}{1 + \cot^2 2\theta} d\theta∫1+cot22θ12sin4θ​dθ

[5]
Markscheme

Integration Questions

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

864 exam-style questions on Edexcel A Level Maths Integration, covering 11.1 Integrating Standard Functions, 11.2 Integrating f(ax + b), 11.3 Using Trigonometric Identities, 11.4 Reverse Chain Rule, 11.5 Integration by Substitution, 11.6 Integration by Parts, 11.7 Partial Fractions, 11.8 Finding Areas, 11.9 The Trapezium Rule, 11.10 Solving Differential Equations, and 11.11 Modelling with Differential Equations. Each one has a worked solution and a mark scheme showing where the marks go.

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