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<math>C_{ij}=\sum_{k=1}^m A_{ik}B_{kj}\,</math>
To compute each element in {{math|'''C'''}} takes {{math|''m''}} multiplications and {{math|(''m'' - ''1'')}} additions. Therefore, with a CPU implementation, the time complexity to achieve the computation is
==== Discrete Cosine Transform ====
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