Solve the Problem $\cos 2 \theta = - \frac { 24 } { 25 }$

Multiple Choice

Solve the problem.
-If $\cos 2 \theta = - \frac { 24 } { 25 }$ , and $\frac { \pi } { 2 } < 2 \theta < \pi$ , then find $\sin \theta$ .

A) $\frac { 7 } { 5 }$
B) $- \frac { 7 } { 5 }$
C) $\frac { 7 \sqrt { 2 } } { 10 }$
D) $- \frac { 7 \sqrt { 2 } } { 10 }$