Let be given ellipse, length of whose latus rectum is 10 . If its eccentricity is the maximum value of the function, , then is equal to:
- (A)126✓ Correct
- (B)135
- (C)116
- (D)145
Answer: (A)
Solution
The latus rectum gives . The function takes its greatest value at , so the eccentricity is . From , . Combining with , gives , so and . Hence .
JEE Main · 2020 · 04 Sep 2020 · Shift 1 · Single correct option