Solve, for 0≤x≤180∘0 \leq x \leq 180^\circ0≤x≤180∘, the equation
sin(x+10∘)=32\displaystyle \sin(x + 10^\circ) = \frac{\sqrt{3}}{2}sin(x+10∘)=23
cos2x=−0.9\cos 2x = -0.9cos2x=−0.9, giving your answers to 1 decimal place.
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.