
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Transcribed Image Text:3. (a) The curve C is defined by the equation
4x² 9y²8x 18y + 31 = 0.
What type of conic section is C? Find (where these exist) its centre, eccentricity,
foci, asymptotes and axis intercepts. Sketch C.
(b) A ellipse C has equation
=
x²
+
q² 6²
where a b>0.
(i) Show that the point P
(x, y) lies on C if and only if there exists some
t = [0, 2π) such that x = a cost and y = b sint.
(You may assume facts about the standard parametrisation of a circle, so long
as you state them clearly.)
(a cos q, b sin q) both lie on C. Prove
(ii) Points P = (a cos p, b sin p) and Q
that the chord PQ has gradient
b
+ (P + a)
(You may assume any of the following identities:
cos
-
a
sin sin = 2 sin
cot
cos+cos o = 2 cos
= 1
(0 + 0) (070)
COS
2
2
(₁ + $) Cos (²₂0)
COS
2
2
(*2*)sin(z).
(iii) Hence show that the tangent to C at the point P has equation
- cos=-2 sin
sin p
b
(Hint: take the limit at q gets closer to p.)
(cosp) x +
a
y = 1.
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