A sound engineer is analyzing a signal processing unit where the phase shift ϕ\phiϕ (in radians) depends on the frequency deviation fff. The relationship is given by the function:
ϕ(f)=arctan(f)+π2,f∈R\phi(f) = \arctan(f) + \frac{\pi}{2}, \quad f \in \mathbb{R}ϕ(f)=arctan(f)+2π,f∈R
Identify the graph of ϕ(f)\phi(f)ϕ(f) from the descriptions provided below.
Graph A: An increasing curve with horizontal asymptotes at ϕ=0\phi = 0ϕ=0 and ϕ=π\phi = \piϕ=π, passing through the point (0,π2)(0, \frac{\pi}{2})(0,2π).
Graph B: An increasing curve with horizontal asymptotes at ϕ=−π2\phi = -\frac{\pi}{2}ϕ=−2π and ϕ=π2\phi = \frac{\pi}{2}ϕ=2π, passing through the origin (0,0)(0, 0)(0,0).
Graph C: A decreasing curve with horizontal asymptotes at ϕ=π\phi = \piϕ=π and ϕ=0\phi = 0ϕ=0, passing through the point (0,π2)(0, \frac{\pi}{2})(0,2π).
Graph D: A curve restricted to the domain f∈[−1,1]f \in [-1, 1]f∈[−1,1] with endpoints at (−1,0)(-1, 0)(−1,0) and (1,π)(1, \pi)(1,π).
Practise Edexcel A Level Maths Trigonometric Functions with exam-style questions for A Level Maths. 36 questions 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, 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.