ఒకవేళ (a - b) ∶ (a + b) = 1 ∶ 5 అయితే, (a2 − b2) ∶ (a2 + b2దేనికి సమానం?

1
2 ∶ 3
2
3 ∶ 2
3
5 ∶ 13
4
13 ∶ 5

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