Use Identities to Find the Indicated Value for Each Angle $\sin \theta = \frac { 21 } { 29 } , \quad \cos \theta > 0 \quad$

Multiple Choice

Use identities to find the indicated value for each angle measure.
- $\sin \theta = \frac { 21 } { 29 } , \quad \cos \theta > 0 \quad$ Find $\cos ( 2 \theta )$

A) $\frac { 41 } { 841 }$

B) $- \frac { 42 } { 841 }$

C) $- \frac { 41 } { 841 }$

D) $\frac { 840 } { 841 }$