Mathematics Extension 2

Transcription

1 Name:.... Maths Teacher:.... SYDNEY TECHNICAL HIGH SCHOOL Year Mathematics Extension TRIAL HSC 06 Time allowed: hours plus 5 minutes reading time General Instructions: Reading time - 5 minutes Working time - hours Marks for each question are indicated on the question. Board -Approved calculators may be used In Questions - 6, show relevant mathematical reasoning and/or calculations. Full marks may not be awarded for careless work or illegible writing Begin each question on a new page Write using black pen All answers are to be in the writing booklet provided A BOSTES reference sheet is provided at the rear of this Question Booklet, and may be removed at any time. Total marks -00 ~ection Multiple Choice 0 Marks Attempt Questions -0 Allow 5 minutes for this section!section! 90 Marks Attempt Questions -6 Allow hours 5 minutes for this section

2 Section I 0 marks Attempt Questions - 0 Allow about 5 minutes for this section Use the multiple- choice answer sheet located in your answer booklet for Questions -0. c conic as eccentricity -. x y (A)-+-=! x y (B) -+-=! Wh. h. h..../? x y (C) ---=!. What value of z satisfies; z = 0i -? (A) -+5i (B) -5i (C) +5i (D) 5-i. Which graph represents the curve, y = (x+ )(x-)? (A) yl (B) y - 0 X -l 0 X I (C) yl (D) y - 0 I X

3 . The polynomial x - l 7x + 5x -7x-7 has a triple root at X =a. What is the value of a? (A) (B) (C) - (D) 5. If Z = + i and Z = -i then z + z is, (A).!.!_; (B). -+-z (C) +i (D) z 8 8 x 6. Which expression is equal to, f--,-dx? COS- X (A) xtanx-f tanxdx () B, (x sec x-j' x tanxdx) (C) x tan x-f xtanxdx (D) x tanx-f xsec xdx 7. What is the natural domain of the function f(x) = ~(x.jx' - -tn(x+.jx' - )l? (A) x:s:- or x:: (B) -:S:x:S: (C) x:: (D) x:s:-

4 8. If a, /, o are the roots of x + x- = 0, then an equation with roots (a+i) (,B+l) (5+) is? (A) x -x +x- = 0 (B) x +x +x+l = 0 (C) x -6x + 6x- = 0 (D) 8x -x +8x- = 0 9. The complex number Z satisfies IZ + = I What is the smallest positive value of the arg( z) on the Argand diagram? (A) l 57l (B) 6 (C) l (D) l 6 0. The base of a solid is the region bounded by the parabola X = y-y and the y axis. Vertical cross sections are right angled isosceles triangles perpendicular to the x-axis as shown. X Which integral represents the volume of this solid? (A) f '- xdx 0 (B) f,r( -x)dx 0 (C) f (8-x)dx 0 (D) f (6-x)dx 0

5 Question ( 5 marks) (a) E xpress i. mt h e f orm, x+zy,. w h ere x an d y are rea. I -i (b) Consider the complex numbers z = - +fii and w=.j( cos(-:) +isil{-:) J (I) (II) Evaluate lzl Evaluate arg(z) () Find the argument of w z (c) Find A, Band C such that I x(x +) A Bx+C -+~- x x + (ii) Hence, or otherwise, find; f dx x(x +) (d) V 0 l t A particle moves along the X - axis. At time, t = 0, the particle is at x = 0. Its velocity V at time t is shown on the graph above. Copy or trace this graph onto your answer page. (ii) (iii) At what time is the acceleration the greatest? Explain your answer. At what time does the particle first return to x = 0? Explain your answer. Sketch the displacement time graph for the particle in the interval, 0 st s 9.

6 Question ( 5 marks) START THIS QUESTION ON A NEW PAGE. (a) Find J x-jx+idx (b) Evaluate (ii) Jr J 0 sin x cos xdx f elnx -dx I X (c) Find the equation of the normal to the curve, xy +iy = 6+ Y at the point (,). (d) Prove that, cos( A-B)x-cos( A+ B)x = sinaxsinbx (ii) Using the above result, express the equation sinxsinx = cosx+, (iii) as a quadratic equation in terms of cos x Hence, solve, sinxsinx=cosx+l for Os;xs;.ir

7 Question ( 5 marks) START THIS QUESTION ON A NEW PAGE. (a) The function y = f ( x) is defined by the equation; f ( ) x(x-) X =~-~ Without the use of calculus, draw sketches of each of the following, clearly labelling any Intercepts, asymptotes and turning points. (ii) (iii) (iv) (v) y=f(x) y' = f(x) xjx-j y= y = tan- J(x) y = ef(x) (b) Sketch the locus of z satisfying (ii) Re(z) =lzl Im(z)?. and Jz-!J s (c) Write down the domain and range of y = sin-.j - x

8 Question ( 5 marks} START THIS QUESTION ON A NEW PAGE. X (a) Use the substitution t = tan- to find 'fz f dx o 5 + cosx + sinx (b) The area enclosed by the curves y = J;. and y = x is rotated about the y- axis. Use the method of cylindrical shells to find the volume of the solid formed. Question continues on the next page...

9 Question continued... (c) )' \. P(asecO,btanO) X R NOT TO SCALE x=-a x=a P(asec B,btan B) lies on the hyperbola - - = I. a b The tangent at P meets the line x = -a and x = a at R and Q respectively. x l (ii) (iii) (iv) xsecb ytanb Show that the equation of the tangent is given by --- I. a b Find the coordinates of Q and R. Show that QR subtends a right angle at the focus S( ae, 0). Deduce that Q,S,R,S' are concyclic.

10 Question 5 ( 5 marks) START THIS QUESTION ON A NEW PAGE. (a) In the diagram, AB and AC are tangents from A to the circle with centre O, meeting the circle at B and C respectively. ADE is a secant of the circle. G is the midpoint of DE. CG produced meets the circle at F. A (ii) (iii) Copy the diagram, using about one third of the page, into your answer booklet and prove that ABOC and AOGC are cyclic quadrilaterals Explain why LOGF = L:OAC. Prove that BF II AE (b) I Let,,=fx".JI-x dr forn".. 0 Show that: I = -.I for n ". 5 n+5 n-j (ii) Hence find 8 (c) A sequence of numbers is given by 7; = 6 T, = 7 and I;, = 6J;,_ -9J;,_ for n ".. Prove by Mathematical Induction that: I;, =(n+l)x" for ':l

11 Question 6 ( 5 marks) START THIS QUESTION ON A NEW PAGE. (a) Show that the minimum value of ae"" +be-"" is M if a, b and m are all positive constants. (b) A particle of mass kilogram is projected upwards under gravity (g) with a speed of k in a medium in which resistance to motion is g k times the square of the speed, where k is a positive constant. Show that the maximum height ( H) reached by the particle is (ii) H=~ln5 g Show that the speed with which the particle returns to its starting point.. k s given by V =.Js (c) The shaded region in the diagram is bounded by the curves y = sinx, y = cosx and the line y =I. This region is rotated around the y- axis. y y=sinx X y=cosx Calculate the volume of the solid formed, using the process of Volume by Slicing. END OF ASSESSMENT TASK

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