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If b² = a²/2 for an ellipse, its eccentricity is
A1/√3
B1/2
C1/√2
D√3/2
Answer & Solution
Correct answer: C. 1/√2
e² = 1 - b²/a² = 1 - 1/2 = 1/2, so e = 1/√2.
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