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The semi-axes of 4x² + 9y² = 1 have lengths
A2 and 3
B4 and 9
C1/2 and 1/3
D1/4 and 1/9
Answer & Solution
Correct answer: C. 1/2 and 1/3
Writing it as x²/(1/4) + y²/(1/9) = 1 gives a = 1/2 and b = 1/3.
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