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Use Identities to Find the Indicated Value for Each Angle cosθ=513,π2<θ<π\cos \theta = - \frac { 5 } { 13 } , \frac { \pi } { 2 } < \theta < \pi \quad

question 10

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Use identities to find the indicated value for each angle measure.
- cosθ=513,π2<θ<π\cos \theta = - \frac { 5 } { 13 } , \frac { \pi } { 2 } < \theta < \pi \quad Find cos(2θ) \cos ( 2 \theta )


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