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1. $4 y^{2} - 5 x^{2} = 20$

A. $\frac{2}{\sqrt{5}}$
B. $\frac{2}{\sqrt{5}}$
C. $\frac{2}{\sqrt{5}}$
D. $\frac{2}{\sqrt{5}}$

Answer: Option B

Explanation:

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