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

A. $\frac{1}{\sqrt{5}}$
B. $\frac{1}{\sqrt{5}}$
C. $\frac{1}{\sqrt{5}}$
D. $\frac{1}{\sqrt{5}}$

Answer: Option A

Explanation:

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