(main)[4]
Find the solutions of $4\sin^4\theta + 12\sin^2\theta - 7 = 0$ for $0^\circ \leq \theta \leq 360^\circ$.
Mathematics 9709 · AS & A Level · Trigonometry
Trigonometry — practice question
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Use $x=\sin^2\theta$ and then obtain $(2x+7)(2x-1)=0$ or an equivalent form.” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI