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The figure below shows the ellipse  \($\frac{(x-20)^2}{20}+\frac{(y-16)^2}{16}=2016$\). Let R_1,R_2,R_3, and R_4 denote those areas within the ellipse that are in the first, second, third, and fourth quadrants, respectively. Determine the value of  $R_1-R_2+R_3-R_4$.

 Apr 16, 2019
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Where is the pic?

 Apr 18, 2019

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