В треугольнике \(\displaystyle ABC\) угол \(\displaystyle C\) равен \(\displaystyle 90^{\circ} {\small,}\) \(\displaystyle M\) – середина стороны \(\displaystyle AB {\small,}\) \(\displaystyle AB=26 {\small,}\) \(\displaystyle BC=18{\small.}\) Найдите \(\displaystyle CM {\small.}\)

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