Use Identities to Find the Indicated Value for Each Angle $\cos 2 \theta = - \frac { 7 } { 9 }$

Use identities to find the indicated value for each angle measure.
- $\cos 2 \theta = - \frac { 7 } { 9 }$ and $\frac { \pi } { 2 } < \theta < \pi \quad$ Find $\sin \theta$ .

A) $\sin \theta = \frac { 2 \sqrt { 2 } } { 3 }$
B) $\sin \theta = - \frac { 2 \sqrt { 2 } } { 3 }$
C) $\sin \theta = \frac { 3 \sqrt { 2 } } { 4 }$
D) $\sin \theta = 0$

Correct Answer:

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