Solve, for 0≤θ<π0 \leq \theta < \pi0≤θ<π,
4cosθ=cosecθ 4 \cos \theta = \operatorname{cosec} \theta 4cosθ=cosecθ137 exam-style questions on Edexcel A Level Maths Trigonometry and Modelling, 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. Each one has a worked solution and a mark scheme showing where the marks go.