9709 P11 - Jun 2024 - Q5 - 6 marks
10092
(a) Prove \(\dfrac{\sin^2x-\cos x-1}{1+\cos x}=-\cos x\). [3]
(b) Hence solve \(\dfrac{\sin^2x-\cos x-1}{2+2\cos x}=\dfrac14\), \(0^\circ\le x\le360^\circ\). [3]
