# Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 2 (P2-9709/02) | Year 2007 | Oct-Nov | (P2-9709/02) | Q#7

Question i. Prove the identity ii. Using the identity, or otherwise, find the exact value of Solution i. We are given that; We have algebraic formula; Since we know that ; We have the trigonometric identity; From this we can write ; Since we know that ; […]