Suppose we follow Sir Isaac Barrow's method of finding the tangent implicitly for the circle with equation x² + y²2 = 9. That is, we replace (x, y) by (x - e, y -a), use the fact that (x, y) belongs to the circle, and then treat certain expressions as "infinitely small" and hence discard them in the equation. After having done all of these, you must arrive at which equation? Ox²2ex + y² - 2ay=0 O-2ex - 2ay = 9 -2ex - 2ay = 0 e² 2ex + a² - 2ay = 0