Solve, for 0<x<π0 < x < \pi0<x<π, the equation (4x−5)(4sin2x−3)=0(4x - 5)(4\sin^2 x - 3) = 0(4x−5)(4sin2x−3)=0 giving your answers in terms of π\piπ where appropriate.
Solve, for 0<θ<360∘0 < \theta < 360^\circ0<θ<360∘, the equation 11cosθ=3cos2θ+811\cos \theta = 3\cos 2\theta + 811cosθ=3cos2θ+8 giving your answers to one decimal place.
Practise Edexcel A Level Maths Trigonometry and Modelling with exam-style questions for A Level Maths. 100 questions covering 7.1 Addition Formulae, 7.2 Double Angle Formulae, 7.3 Solving Trigonometric Equations, 7.4 Simplifying a cos x +- b sin x, 7.5 Proving Trigonometric Identities, and 7.6 Modelling with Trigonometric Functions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.