+0

+1
29
1
+5

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