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The figure below shows the ellipse \(\frac{(x-20)^2}{20}+\frac{(y-16)^2}{16}=2016\).

Let R1, R2, R3 and R4 denote those areas within the ellipse that are in the first, second, third, and fourth quadrants, respectively. Determine the value of R_1-R_2+R_3-R_4 .

 Nov 20, 2017
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I don't think that's correct

 Nov 21, 2017

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