9709 P12 - Nov 2009 - Q5 - 6 marks
418
(i) Prove the identity \((\sin x + \cos x)(1 - \sin x \cos x) \equiv \sin^3 x + \cos^3 x\).
(ii) Solve the equation \((\sin x + \cos x)(1 - \sin x \cos x) = 9 \sin^3 x\) for \(0^\circ \leq x < 360^\circ\).
Solutions locked. Please sign in with access to view them.