Is trigonometry on the AQA, Edexcel and OCR A Level Maths exams?
Yes. Trigonometry is part of the A Level Maths content that every board examines: AQA section E, Edexcel Pure 5, OCR 1.05. It is assessed in AQA Paper 1, and Section A of Papers 2 and 3; Edexcel Paper 1 and Paper 2; OCR A Paper 1, and the pure sections of Papers 2 and 3.
Is trigonometry Year 12 or Year 13 content?
Both. The AS content, usually taught in Year 12, is: Sine rule, cosine rule and the area of a triangle, ½ab sin C; Graphs of sine, cosine and tangent, and exact values; The identities tan θ = sin θ / cos θ and sin²θ + cos²θ = 1; Solving trigonometric equations in a given interval. The full A Level adds: Radian measure, arc length and sector area; small-angle approximations; sec, cosec and cot; arcsin, arccos and arctan; Compound-angle and double-angle formulae; Writing a cos θ + b sin θ as R cos(θ ± α) or R sin(θ ± α); Proving identities and solving harder equations.
Should my calculator be in degrees or radians?
Use degrees when the question gives angles in degrees, and radians whenever calculus, arc length or sector area is involved, or the interval is given in terms of π. Check the mode before every trigonometry question.