In triangle $ABC,$ $b = 5,$ $c = 4,$ and $\cos (B - C) = \frac{31}{32}.$  Find $a.$

Note: $a$ is the side length opposite $\angle A,$ etc.
Question:
In triangle $ABC,$ $b = 5,$ $c = 4,$ and $\cos (B - C) = \frac{31}{32}.$  Find $a.$

Note: $a$ is the side length opposite $\angle A,$ etc.
Answer:
Let's think step by step.

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In triangle $ABC,$ $b = 5,$ $c = 4,$ and $\cos (B - C) = \frac{31}{32}.$  Find $a.$

Note: $a$ is the side length opposite $\angle A,$ etc.
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