Ellipse 2 Question 23
23. Suppose that the foci of the ellipse are and , where and . Let and be two parabolas with a common vertex at with foci at and , respectively. Let be a tangent to which passes through and be a tangent to which passes through . If is the slope of and is the slope of , then the value of is
(2015 Adv.)
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Answer:
Correct Answer: 23. (d)
Solution:
Tangent to
Also, tangent to