If A=⎡⎢⎣02bcab−ca−bc⎤⎥⎦ is orthogonal, then |abc| is equal to

If A=⎡⎢⎣02bcab−ca−bc⎤⎥⎦ is orthogonal, then |abc| is e

1.	If A=⎡⎢⎣02bcab−ca−bc⎤⎥⎦ is orthogonal, then \|abc\| is equal to
Answer» If $A = ⎡ ⎢ ⎣ \begin{matrix} 0 & 2 b & c a & b & - c a & - b & c \end{matrix} ⎤ ⎥ ⎦$ is orthogonal, then $\| a b c \|$ is equal to