Mathematics 9709 · AS & A Level · Trigonometry

Trigonometry — practice question

(main)[5]

Solve the equation $\sec \theta \cos(\theta - 60^\circ) = 4$ within $-180^\circ < \theta < 180^\circ$.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Rewrite the equation so that only $\cos\theta$ and $\sin\theta$ appear, using a correct identity together with $\sec\theta=\dfrac{1}{\cos\theta}$” …

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI