Trigonometry! 40

Geometry Level 4

In \(\Delta ABC\), find \(c\), given \(a=5\), \(b=4\) and \(\cos (A-B) = \frac {31}{32}\).

\(a\), \(b\) and \(c\) are the sides of the triangle opposite to angles \(A\), \(B\) and \(C\).

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