Solve, for 0≤x<360∘0 \leq x < 360^\circ0≤x<360∘,
sin(x−20∘)=12\displaystyle \sin(x - 20^\circ) = \frac{1}{\sqrt{2}}sin(x−20∘)=21
cos3x=−12\displaystyle \cos 3x = -\frac{1}{2}cos3x=−21
Practise Edexcel A Level Old Maths Trigonometry with exam-style questions for A Level Old Maths. 13 questions, matched to the Edexcel A Level Old Maths (9371) specification and written in Unit exams C1, C2, C3 and C4 plus two applied units (e.g. S1 and M1) 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.