Express cos2β \cos^2 \beta\,cos2β in terms of cos2β\cos 2\betacos2β.
Find ∫cos2β dβ\int \cos^2 \beta \, d\beta∫cos2βdβ.
31 exam-style questions on Edexcel A Level Maths 11.3 Using Trigonometric Identities. Each one has a worked solution and a mark scheme showing where the marks go.