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If (a-b):(a+b)=1:5, then what is (a^(2)-...

If `(a-b):(a+b)=1:5`, then what is `(a^(2)-b^(2)):(a^(2)+b^(2))` equal to?

A

`2:3`

B

`3:2`

C

`5:13`

D

`13:5`

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