The eccentricity of the ellipse \( 5 x^{2}+9 y^{2}=1 \) is (A) \( 2 / 3 \) (B) \( 3 / 4 \) (C) \...

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The eccentricity of the ellipse \( 5 x^{2}+9 y^{2}=1 \) is
(A) \( 2 / 3 \)
(B) \( 3 / 4 \)
(C) \( 4 / 5 \)
(D) \( 1 / 2 \)
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