Solve, for −180≤θ≤180-180 \leq \theta \leq 180−180≤θ≤180, the equation,
2tan2θ−sec2θ+secθ=4 2\tan^2\theta - \sec^2\theta + \sec\theta = 4 2tan2θ−sec2θ+secθ=4Give your answers to 1 decimal place where appropriate.
54 exam-style questions on Edexcel A Level Maths Trigonometric Functions, covering 6.1 Secant, Cosecant and Cotangent, 6.2 Graphs of Sec x, Cosec x and Cot x, 6.3 Using Sec x, Cosec x and Cot x, 6.4 Trigonometric Identities, and 6.5 Inverse Trigonometric Functions. Each one has a worked solution and a mark scheme showing where the marks go.