Use identities to find the indicated value for each angle measure.
-$\cos 2 \theta = \frac { 4 } { 5 }$ and $\theta$ terminates in quadrant III $\quad$ Find $\cos \theta$.
A) $\cos \theta = \frac { 3 \sqrt { 10 } } { 10 }$
B) $\cos \theta = 0$
C) $\cos \theta = - \frac { \sqrt { 10 } } { 3 }$
D) $\cos \theta = - \frac { 3 \sqrt { } } { 10 }$

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The Answer of Use identities to find the indicated value for each angle measure.
-$\cos 2 \theta = \frac { 4 } { 5 }$ and $\theta$ terminates in quadrant III $\quad$ Find $\cos \theta$.
A) $\cos \theta = \frac { 3 \sqrt { 10 } } { 10 }$
B) $\cos \theta = 0$
C) $\cos \theta = - \frac { \sqrt { 10 } } { 3 }$
D) $\cos \theta = - \frac { 3 \sqrt { } } { 10 }$

Use Identities to Find the Indicated Value for Each Angle cos⁡2θ=45\cos 2 \theta = \frac { 4 } { 5 }cos2θ=54​

Use Identities to Find the Indicated Value for Each Angle $\cos 2 \theta = \frac { 4 } { 5 }$