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Mathematics

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An ellipse with major and minor axis length as 2a and 2b units touches coordinate axis in first quadrant. If foci are (x₁,y₁) and (x₂,y₂), then the value of x₁x₂+y₁y₂ is
A. 2a²
B. 2b²
C. a²b²
D. a²+b²

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