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Unformatted text preview: Section A: Pure Mathematics 1 Two curves have equations x 4 + y 4 = u and xy = v , where u and v are positive constants. State the equations of the lines of symmetry of each curve. The curves intersect at the distinct points A , B , C and D (taken anticlockwise from A ). The coordinates of A are ( , ), where > > 0. Write down, in terms of and , the coordinates of B , C and D . Show that the quadrilateral ABCD is a rectangle and find its area in terms of u and v only. Verify that, for the case u = 81 and v = 4, the area is 14. 2 The curve C has equation y = a sin( e x ) , where a > 1. (i) Find the coordinates of the stationary points on C . (ii) Use the approximations e t 1 + t and sin t t (both valid for small values of t ) to show that y 1 x ln a for small values of x . (iii) Sketch C . (iv) By approximating C by means of straight lines joining consecutive stationary points, show that the area between C and the xaxis between the k th and ( k + 1)th maxima is approximately a 2 + 1 2 a ln 1 + ( k 3 4 ) 1 . 3 Prove that tan ( 1 4  1 2 x ) sec x tan x . ( * ) (i) Use ( * ) to find the value of tan 1 8 . Hence show that tan 11 24 = 3 + 2 1 3 6 + 1 . (ii) Show that 3 + 2 1 3 6 + 1 = 2 + 2 + 3 + 6 . (iii) Use ( * ) to show that tan 1 48 = q 16 + 10 2 + 8 3 + 6 6 2 2 3 6 . 4 The polynomial p( x ) is of degree 9 and p( x ) 1 is exactly divisible by ( x 1) 5 ....
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 Spring '12
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 Math, Equations

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