Which of the following choices are the angles and side lengths of the given triangle? Arccos = β



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45º, 45º, 90º; 1, 1, √2
30º, 60º, 90º; 1, 1, √2
45º, 45º, 90º; 1, √3, 2
30º, 60º, 90º; 1, √3, 2