In \( \triangle A B C \), the lengths of the three sides \( A B, B ...

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In \( \triangle A B C \), the lengths of the three sides \( A B, B C \) and \( C A \) are \( 28 \mathrm{~cm}, 96 \mathrm{~cm} \) and \( 100 \mathrm{~cm} \) respectively. Find the value of \( \cos C \).
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