The vertical displacement ddd (in mm) of a tuning fork's prong over a cycle is modeled by the function
d=sinθ∘ d = \sin \theta^\circ d=sinθ∘for −360≤θ≤360-360 \le \theta \le 360−360≤θ≤360.
A point A A\,A on the displacement curve has coordinates (a,−32)(a, -\frac{\sqrt{3}}{2})(a,−23).
(i) Determine the value of aaa, given that −180<a<−90-180 < a < -90−180<a<−90.
(ii) State the value of sin(a∘+720∘)\sin(a^\circ + 720^\circ)sin(a∘+720∘).
A second point B B\,B on the curve has coordinates (b,37)(b, \frac{3}{7})(b,73), where 0<b<900 < b < 900<b<90.
(i) Find the exact value of sin(b∘−180∘)\sin(b^\circ - 180^\circ)sin(b∘−180∘).
(ii) Find the exact value of cosb∘\cos b^\circcosb∘.
Practise AQA A Level Maths 1.8 E: Trigonometry with exam-style questions for A Level Maths. 239 questions covering 1.8.1 Trigonometric definitions, rules and radians, 1.8.2 Small angle approximations (A-level only), 1.8.3 Trigonometric functions and exact values, 1.8.4 Reciprocal and inverse trigonometric functions (A-level only), 1.8.5 Trigonometric identities, 1.8.6 Compound and double angle formulae (A-level only), 1.8.7 Solving trigonometric equations, 1.8.8 Proofs with trigonometric identities, and 1.8.9 Trigonometry in context, matched to the AQA A Level Maths (7357) 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.
