(i) Integrate the following functions by using the given substitution
(iii) If , prove that and hence show that y increases as x increases in the domain .
(iv) By giving x an appropriate value in prove that
[ans: (i) (a) (b) ]
(i) Use the substitution to show that
(ii) Factorise the polynomial , given that P(x) has a repeated root.
(iii) The polynomial Qx) has the form Qx) = P(x) (x+a) with P(x) as in (ii) and where the constant a is chosen so that Q(x) > 0 for all real x. Find possible values of a.
(iv) A particle undergoes a SHM about the origin O. Its displacement x from O is given by where t is the time (in seconds).
(a) Express the acceleration as a function of displacement
(b) write down the amplitude
(c) find x for which the speed is maximum and this speed.
(i) A meeting room contains a round table with 10 chairs. These chairs are equally spaced and indistinguishable.
(a) A committee of 10 persons included 3 teenagers are to seat. How many sitting arrangements can be done if the teenagers are to sit together ?
(b) Elections are held for the position of chairperson and secretary in a 2nd committee of 10 people seated around the table. What is the probability that the 2 elected people are sitting directly opposite each other ?
(ii) A scientist found that the amount Q(t) of a substance present in a mineral at time t is satisfied the equation
(a) verify that Q(t) = satisfied this equation for any constant A>0.
(b) If Q(0) = 10 mg, find the maximum value of Q(t) and the time at which this occurs.
(c) Describe what happen to Q(t) when t increases indefinitely.
(i) If prove that .
(ii) A sequence (known as the Fibonacci sequence) is defined as (n > 2). Prove by mathematical induction that
(iii) If . Express in terms of y. Hence solve the equation .
(i) In a certain GP series, the sum of the first 4 terms is -5 and the sum of the first 8 terms is . Show that and that . Hence by division, show that and that r = +1/2. Show that there are two possible sequences and find them.
(ii) By considering a right angled triangle in which the hypotenuse is 1 unit and the other sides is x units. Show that for 0<x<1, . Furthermore, prove by substitution that for (a) x = 0 (b) 1<x<0.
(iii) Hence verify the result for the derivative of obtained in (ii).
(i) Prove that
(ii) P and Q are points on a circle and the tangents to the circle at P and Q meets at S. R is a pont on the circle so that PR // QS. Prove that PQ = QR.
(iii) A circle has equation
(a) Find the centre and radius of the circle.
(b) The line x + 2y = 0 meets the circle at A and B. Find the coordinates of A and B and hence its length.
(i) A wall 27 m high stands on a horizontal plane. From a point O in this plane, a ball is projected in a plane at right angles to the wall at an angle with the horizontal, where tan = 3/4. The ball just clears the top of the wall. If O is 96 m from the wall, find the time taken to reach the wall and show that the speed of projection is 40 m/s.
(a) Find the greatest height to which the ball will rise beyond the horizontal plane.
(b) Find the range.
(ii) The chord PQ in the parabola subtends a right angle at the vertex of the parabola. The normals to P and Q meets at R.
(a) Prove that pq = -4 where p and q are parameters of the points P and Q.
(b) Show that as P and Q take varied positions on the parabola, the locus of R is .