if (a+b):(a-b) = 1:5 .then a^2-b^2:a^2+b^2 equals
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a+b / a-b = 1/5
a+b+a-b / a+b-a+b = 1+5 / 1-5
a/b = - 3/2
a^2 / b^2 = 9/4
a^2 - b^2 / a^2 + b^2 = 9-4 / 9+4 = 5/13
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