(main)[5]
Solve the equation $2\cos x - \cos\left(\frac{1}{2}x\right) = 1$ for $0 \leq x \leq 2\pi$.
Mathematics 9709 · AS & A Level · Trigonometry
Trigonometry — practice question
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply the correct double angle formula to form an equation that involves only $\cos\left(\frac{x}{2}\right)$.” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI