Mathematics, 15.01.2020 05:31 Frankie103947
Find all 2 × 2 matrices a such that det a−1 and a = a-1
Answers: 1
, if A is its own inverse![\left[\begin{array}{ccc}\sqrt{1-bc}&b\\c&-\sqrt{1-bc}\end{array}\right]](/tpl/images/0455/6180/8061b.png)
or![\left[\begin{array}{ccc}-\sqrt{1-bc}&b\\c&\sqrt{1-bc}\end{array}\right]](/tpl/images/0455/6180/10633.png)
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Find all 2 × 2 matrices a such that det a−1 and a = a-1...
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