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# (a) Parametrise C1 and C2. Hint: Use t : 􀀀t0 ! t0 as limits when parametrising C2 and explain why cos(t0) =

1. (a) Parametrise C1 and C2. Hint: Use t : 􀀀t0 ! t0 as limits when parametrising
C2 and explain why cos(t0) = 􀀀
4
5
and sin(t0) =
3
5
.
(b) Calculate I
C
v  dr
where v =
1
2
(􀀀yi + xj).
(c) Use Green`s theorem and your answer from 1(b) to determine the area of R
and then verify that it is less than ab.
2. (a) Give the cartesian equation for the ellipse used to de ne C2.
(b) Show that 9 + 4r cos  = 5r is the equation of that ellipse when written in
polar coordinates (r; ). Hint: Square both sides rst.
(c) Calculate ZZ
R
1
r3dA
using polar coordinates. Hint: Integrate with respect to r rst and then .
Explain why the limits on the outer integral should be  = 

2
.
3. If T(r) = T0=r3 is the temperature pro le in the region R, then use the previous
results to calculate the average temperature in R when T0 = 1000. Verify that the
average temperature is between the minimum and maximum temperatures in R.

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