Use Identities to Find the Indicated Value for Each Angle $\cos 2 \theta = - \frac { 5 } { 7 }$

Multiple Choice

Use identities to find the indicated value for each angle measure.
- $\cos 2 \theta = - \frac { 5 } { 7 }$ and $\frac { \pi } { 2 } < \theta < \pi \quad$ Find $\sin \theta$

A) $\sin \theta = \frac { \sqrt { 42 } } { 6 }$

B) $\sin \theta = 0$

C) $\sin \theta = \frac { \sqrt { 42 } } { 7 }$

D) $\sin \theta = - \frac { \sqrt { 42 } } { 7 }$