Mathematics · Matrices and Determinants
If A = º 1 tan x º º -tan x 1 º, then AT · A-1 =
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- 1º cos 2x sin 2x º º -sin 2x cos 2x º
- 2º cos 2x -sin 2x º º sin 2x cos 2x º✓
- 3º -cos 2x sin 2x º º -sin 2x cos 2x º
- 4º cos 2x -sin 2x º º -sin 2x cos 2x º
Correct answer
º cos 2x -sin 2x º º sin 2x cos 2x º
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