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3 Unit A2 1: Pure Mathematics (A-level only)

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Question 90

The curve C1 C_1\,C1​ has parametric equations

x=6cos⁡tx = 6\cos tx=6cost, y=25sin⁡ty = 2\sqrt{5}\sin ty=25​sint, where 0≤t<2π0 \leq t < 2\pi0≤t<2π

C1 C_1\,C1​ meets the circle C2C_2C2​, which has equation x2+y2=25x^2 + y^2 = 25x2+y2=25, at four distinct points, as shown in Figure 1 below.

Figure for question 2

Find the exact Cartesian coordinates of the four points of intersection.

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3 Unit A2 1: Pure Mathematics (A-level only) Questions

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