# Value of a fraction

It it real that is ${a^2+c^2\over b^2+d^2}=1$ for $ad-bc=1$?

I attempted replacing in $a={1-bc\over d}$ yet it is still a mess.

(How do you ask Wolfram Alpha an inquiry similar to this where we ask it to compute something with an enforced problem?)

1
2022-07-25 20:46:47
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