2010015207

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2010015207
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The lengths of the sides of a triangle are \( 4\,\mathrm{cm} \), \( 6\,\mathrm{cm} \) and \( 8\,\mathrm{cm} \). Calculate cosine of its greatest interior angle.
\( -\frac14\)
\( 104.47^{\circ}\)
\( 28.96^{\circ}\)
\(\frac78\)