[HGS] [2023] 4E AM 4049 Prelims P2_MS

HGV Sec 4E Preliminary Examination Additional Mathematics Paper 2 2023 [MARK SCHEME] 1 HILLGROVE SECONDARY SCHOOL PRELIMINARY EXAMINATION 2023 SECONDARY FOUR (EXPRESS) [MARK SCHEME] CANDIDATE NAME ( ) CLASS - CENTRE NUMBER S INDEX NUMBER Additional Mathematics Paper 2 Candidates answer on the Question Paper. No Additional Materials are required. 4049/02 29 August 2023 2 hours 15 minutes 10.05 a.m. – 12.20 p.m. READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all the questions. Give non-exact numerical answers correct to 3 significant figures, or 1 decimal place in the case of angles in degrees, unless a different level of accuracy is specified in the question. The use of an approved scientific calculator is expected, where appropriate. You are reminded of the need for clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 90. For Examiner’s Use Parent’s/ Guardian’s Signature: ___________________ TOTAL 90 Setters: Mdm Lee Li Lian This document consists of 24 printed pages, including this page.

HGV Sec 4E Preliminary Examination Additional Mathematics Paper 2 2023 [MARK SCHEME] 2 Mathematical Formulae 1. ALGEBRA Quadratic Equation For the equation 2 0ax bx c+ + = , 2 4 2 b b acx a −  −= Binomial expansion ( ) 1 2 2 ... ... ,12 n n n n n r r nn n na b a a b a b a b b r − − −     + = + + + + + +           where n is a positive integer and ( ) ! ( 1)...( 1) ! ! ! n n n n n r r r n r r  − − +== − 2. TRIGONOMETRY Identities 22sin cos 1AA+= 22sec 1 tanAA=+ 22cosec 1 cotAA=+ sin( ) sin cos cos sinA B A B A B =  cos( ) cos cos sin sinA B A B A B= tan tantan( ) 1 tan tan ABAB AB = sin 2 2sin cosA A A= 2 2 2 2cos 2 os sin 2 os 1 1 2sinA c A A c A A= − = − = − 2 2 tantan 2 1 tan AA A= − Formulae for ABC sin sin sin a b c A B C== 2 2 2 2 cosa b c bc A= + − 1 sin2 ab C=

HGV Sec 4E Preliminary Examination Additional Mathematics Paper 2 2023 [MARK SCHEME] 3 1 A calculator must not be used in this question. (a) Show that tan15 2 3= − . [4] tan15 tan(45 30 ) tan 45 tan 30 1 tan 45 tan 30 31 3 [A1] 311 3 31 3 31 3 3 3 3 3 33 3 3 3 3 33 3 3 3 3 [M1] 3 3 3 3 9 6 3 3 [ 93 = −  − = +   − = + − = + −+= −= + −−= +− −+= − M1] 12 6 3 6 2 3 [A1] −= =− Alternative Method tan15 tan(60 45 ) tan 60 tan 45 1 tan 60 tan 45 31