a^2 + d^2 − ad = b^2 + c^2 + bc a^2 + b^2 = c^2 + d^2 ((ab + cd)/(ad + bc)) = ?


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Question Number 57390 by naka3546 last updated on 03/Apr/19

$a^{2} + d^{2} - a d = b^{2} + c^{2} + b c$ $a^{2} + b^{2} = c^{2} + d^{2}$ $\frac{a b + c d}{a d + b c} = ?$
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