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$ \sin ^2 (x) = \frac{1}{2} $ $ \sin (x) = - \sqrt {\frac{1}{2}} $ of $ \sin (x) = \sqrt {\frac{1}{2}} $ $ \sin (x) = - \frac{1}{2}\sqrt 2 $ of $ \sin (x) = \frac{1}{2}\sqrt 2 $ $ x = 1\frac{1}{4}\pi + k \cdot 2\pi $ of $ x = 1\frac{3}{4}\pi + k \cdot 2\pi $ of $ x = \frac{1}{4}\pi + k \cdot 2\pi $ of $ x = \frac{3}{4}\pi + k \cdot 2\pi $ $ x = \frac{1}{4}\pi + k \cdot \frac{1}{2}\pi $
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