If \[\sin \theta =\frac{-4}{5}\] and \[\theta \] lies in the third quadrant, then \[\cos \frac{\theta }{2}=\]

If \[\sin \theta =\frac{-4}{5}\] and \[\theta \] lies in the third qua

1.	If \[\sin \theta =\frac{-4}{5}\] and \[\theta \] lies in the third quadrant, then \[\cos \frac{\theta }{2}=\]
A.	\[\frac{1}{\sqrt{5}}\]
B.	\[-\frac{1}{\sqrt{5}}\]
C.	\[\sqrt{\frac{2}{5}}\]
D.	\[-\sqrt{\frac{2}{5}}\]
Answer» C. \[\sqrt{\frac{2}{5}}\]

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If \[\sin \theta =\frac{-4}{5}\] and \[\theta \] lies in the third quadrant, then \[\cos \frac{\theta }{2}=\]

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