Cho sin(45°– α) = \(\frac{1}{{2\sqrt 2 }}\). Chứng minh rằng \({\sin ^2}\left( {45^\circ - \alpha } \right) = \frac{2}\).

Cho sin(45°– α) = \(\frac{1}{{2\sqrt 2 }}\).

Chứng minh rằng \({\sin ^2}\left( {45^\circ - \alpha } \right) = \frac{2}\).