જો $ \text{A, B, C}$ એ ત્રિકોણના ખૂણા હોય , તો $\left| {\,\begin{array}{*{20}{c}}{ - 1}&{\cos C}&{\cos B}\\{\cos C}&{ - 1}&{\cos A}\\{\cos B}&{\cos A}&{ - 1}\end{array}\,} \right| = $
Difficult
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