ACJC Question Paper 1

ANGLO-CHINESE JUNIOR COLLEGE MATHEMATICS DEPARTMENT MATHEMATICS Higher 2 Paper 1 23 August 2012 JC 2 PRELIMINARY EXAMINATION Time allowed : 3 hours Additional Materials: List of Formulae (MF15) READ THESE INSTRUCTIONS FIRST Write your Index number, Form Class, graphic and/or scientific calculator model/s on the cover page. Write your Index number and full name on all the work you hand in. Write in dark blue or black pen on your answer scripts. You may use a soft pencil for any diagrams or graphs. Do not use paper clips, highlighters, glue or correction fluid. Answer all the questions. Give non-exact numerical answers correct to 3 signi ficant figures, or 1 decimal place in the case of angles in degrees, unless a different level of accuracy is specified in the question. You are expected to use a graphic calculator. Unsupported answers from a graphic calculator are a llowed unless a question specifically states otherwise. Where unsupported answers from a graphic calculator are not allowed in the question, you are required to present the mathematical steps using mathematical notations and not calculator commands. 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. At the end of the examination, fasten all your work securely together. This document consists of 5 printed pages. [Turn Over 9740 / 01

Anglo-Chinese Junior College H2 Mathematics 9740: 2012 JC 2 Preliminary Examination Paper 1 Page 2 of 5 ANGLO-CHINESE JUNIOR COLLEGE MATHEMATICS DEPARTMENT JC2 Preliminary Examination 2012 MATHEMATICS 9740 Higher 2 Paper 1 Calculator model : _____________________ Arrange your answers in the same numerical order. Place this cover sheet on top of them and tie them together with the string provided. Question No. Marks 1 /7 2 /4 3 /8 4 /8 5 /5 6 /8 7 /7 8 /7 9 /5 10 /7 11 /10 12 /7 13 /5 14 /12 / 100 Index No: Form Class: ___________ Name: _________________________

Anglo-Chinese Junior College H2 Mathematics 9740: 2012 JC 2 Preliminary Examination Paper 1 Page 3 of 5 1 (a) Find 2 d 4 7 x xx x + + ∫ . [3] (b) Find 0 d a x a x x −∫ by using integration by parts. [4] 2 The functions f and g are defined by 2 2 2f : 2 5 2 x x x x x + − + /arrowbarright, 1, , 2 2x x +∈ ≠ /Rbb , 2 3g : , 2 5 2 x x x − − + /arrowbarright1, , 2 2x x +∈ ≠ /Rbb . Without the use of the graphic calculator, find the subset of the domain for which the value of ( )f x is greater than or equal to the value of ( )g x . [4] 3 The function f is defined by ( ) 22f : ln ln , 0 x x x x − > /arrowbarright. Sketch the graph of f ( ) y x = , indicating clearly all points of intersection wit h the axes. Explain why the inverse function 1f − does not exist. [3] The function h is defined by ( ) 22h : ln ln , 0 . x x x x a − < ≤ /arrowbarright State the greatest possible value of a for which the inverse function 1h − exists. Find the inverse function 1h − in similar form. [4] The function g is defined by g : 3e , . xx x ∈/arrowbarright /Rbb Find the range of the composite function gh . [1] 4 Tom and Jerry each start a new job. Tom is paid $3 0,000 in the first year, and in every subsequent year, his annual pay will increase by $1 ,500. Jerry is paid $25,000 in the first year, and in every subsequent year, his annual pay will increase by 5%. If they both start working at the beginning of 201 3, (i) what is the first year in which Jerry will be pai d more than Tom? [4] (ii) at the end of which year will Jerry’s total incom e first exceed Tom’s total income? [4] [Turn Over

Anglo-Chinese Junior College H2 Mathematics 9740: 2012 JC 2 Preliminary Examination Paper 1 Page 4 of 5 5 A metal tank with an open top is in the form of a r ight circular cylinder. The total cost of metal used to make the tank is a fixed amount $ A. The metal used to make the base costs $B per unit area and the metal used to make the curve d surface costs $ C per unit area, where B and C are constants. Given that the radius of the base of the tank is r, express the volume V of the tank in terms of r, A, B and C. Use differentiation to find, in terms of A, the cost of the metal used to make the base which gives a tank of maximum volume. [5] 6 If 0 1 4u = and 1 3 2 1 n n n uu u + = + for any non-negative integer n, write down the values of u1, u2, u3 and u4 in the form f ( ) 1 f ( ) n n+ , where f ( ) n is expressed in terms of n. Hence formulate a conjecture for nu in terms of n. [3] Prove your conjecture by the method of mathematica l induction for any non-negative integer n. [5] 7 A curve has parametric equations 2 2 , e tx t y −= = . Sketch the curve, stating the exact coordinates of any points of intersection with the axes and the equations of any asymptotes. [2] Find the equation of the normal to the curve at th e point ( ) 2 2 ,e pp − . [2] The normal at the point C 12, e       meets the x-axis at A and the y-axis at B. Find the value of the ratio :OA OB , where O is the origin, giving your answer in terms of e. [3] 8 The equation of a curve is 2 2 3x a y x a −= − , where a is a positive constant. Find the equations of the asymptotes of the curve and show that there are no stationary points on the curve. [3] Sketch the graph, stating, in terms of a, the coordinates of any points of intersection wit h the axes. [2] By considering the graph of ( )fy x ′= , where ( ) 2 2 3f x a x x a −= − , or otherwise, state, in terms of a, the range of values of x for which the function f ′ is increasing. [2] 9 The complex number z satisfies the relations 2z ≤ and arg 6 2 zπ π ≤ ≤ . Illustrate both of these relations on a single Argand diagram as the region R. [3] Given that l is the locus of points such that ( )arg 3 z k − = , where kπ π − < ≤ , find the set of values of k such that l and R have no common point. [2]

Anglo-Chinese Junior College H2 Mathematics 9740: 2012 JC 2 Preliminary Examination Paper 1 Page 5 of 5 10 (i) Show that 1 a b a b a b −= −+ . [1] (ii) Find 2500 1 1 4 3 4 1 r r r = − + + ∑ exactly. [3] (iii) Hence show, without using a calculator, that 2500 0 1 24 4 1 4 5 r r r = > + + + ∑ . [3] 11 OABC is a rhombus. The points A and C are such that aOA = /combarrowextender/combarrowextender/combarrowextender /arrowrightnosp and cOC = /combarrowextender/combarrowextender/combarrowextender /arrowrightnosp . The point M is the centre of the rhombus and angle AOC is 60 ∘. (i) By using scalar products, show that the length of projection of OM /combarrowextender/combarrowextender/combarrowextender/combarrowextender /arrowrightnosp on OC /combarrowextender/combarrowextender/combarrowextender /arrowrightnosp is 3 4 c .[4] (ii) By using a vector product, show that the area of triangle OMC can be written as 2 ck where k is a constant to be found. [3] (iii) The point D lies on OC produced such that : 2 : 3 OC CD = . Show that the shortest distance from D to the line OA can be written as ct where t is a constant to be found. [3] 12 (i) Show, by using the substitution 2 yw t = , that the general solution of the differential equation 2 3 d 2 2 d wt w t wt w t = + − is 2 2 2 1 2 e 1 e t t Aw t A   =     −  . [5] (ii) Sketch, on a single diagram, two members of the f amily of solution curves corresponding to 0A = and to 0A > respectively. [2] 13 Find the set of values of θ lying in the interval 2 2 π π θ− < < such that the sum to infinity of the geometric series 2 3 1 tan tan tan θ θ θ + + + + /midhorizellipsis exists and is less than 3 3 2 + . Give your answer(s) in exact form. [5] 14 (a)