If m:n = 13:11, find m\(^2\) - n\(^2\) : (m + n)\(^2\)
m : n = 13 : 11 m\(^2\) - n\(^2\) : (m + n)2 = 13\(^2\) - 11\(^2\) : (13 + 11)\(^2\) = 169 - 121 : 24\(^2\) = 48 : 576 = 1 : 12
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