1.

\(\sqrt {1 + \sin A} = - \left( {\sin \frac{A}{2} + \cos \frac{A}{2}} \right)\) is true if

A. \(\frac{{3\pi }}{2} < A < \frac{{5\pi }}{2}\) only
B. \(\frac{\pi }{2} < A < \frac{{3\pi }}{2}\) only
C. \(\frac{{3\pi }}{2} < A < \frac{{7\pi }}{2}\)
D. \(0 < A < \frac{{3\pi }}{2}\)
Answer» D. \(0 < A < \frac{{3\pi }}{2}\)


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