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An ellipse with major and minor axes len...

An ellipse with major and minor axes lengths `2a` and `2b ,` respectively, touches the coordinate axes in the first quadrant. If the foci are `(x_1, y_1)a n d(x_2, y_2)` , then the value of `x_1x_2` and `y_1y_2` is 9a) `a^2` (b) `b^2` (c) `a^2b^2` (d) `a^2+b^2`

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