An optical sensor measures the angular deflection ϕ \phi\,ϕ of a light beam. During a calibration test, the system reaches equilibrium when the following relationship is satisfied:
7tanϕ=4cosϕ 7 \tan \phi = 4 \cos \phi 7tanϕ=4cosϕShow that this equilibrium condition can be expressed as the quadratic equation
4sin2ϕ+7sinϕ−4=0 4 \sin^2 \phi + 7 \sin \phi - 4 = 0 4sin2ϕ+7sinϕ−4=0A specific configuration of the sensor requires that the deflection varies such that ϕ=3ψ\phi = 3\psiϕ=3ψ. Determine all possible values of ψ \psi\,ψ in the range 0∘≤ψ≤60∘ 0^\circ \le \psi \le 60^\circ\,0∘≤ψ≤60∘ that satisfy the equilibrium condition:
7tan(3ψ)=4cos(3ψ) 7 \tan(3\psi) = 4 \cos(3\psi) 7tan(3ψ)=4cos(3ψ)Give your answers to 2 decimal places.
84 exam-style questions on CCEA A Level Maths 1.4 Trigonometry, covering 1.4.1 Trigonometry, 1.4.2 Trigonometry, 1.4.3 Trigonometry, 1.4.4 Trigonometry, 1.4.5 Trigonometry, 1.4.6 Trigonometry, and 1.4 Trigonometry. Each one has a worked solution and a mark scheme showing where the marks go.