The magnitudes of three vectors \(\vec A,\vec B,\vec C\) are \(12,5\), and \(13\) units respectively and \(\vec A+\vec B=\vec C\). The angle between \(\vec A\) and \(\vec B\) is
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If \(A^2+B^2=C^2\), then the vectors \(A\) and \(B\) are perpendicular.