If \( a^{2}+b^{2}+c^{2}=1 \), then
\[
\left|\begin{array}{cc}
a^{2}...
If \( a^{2}+b^{2}+c^{2}=1 \), then
\[
\left|\begin{array}{cc}
a^{2}+\left(b^{2}+c^{2}\right) \cos \phi & a b(1-\cos \phi) \\
b a(1-\cos \phi) & b^{2}+\left(c^{2}+a^{2}\right) \cos \phi \\
c a(1-\cos \phi) & c b(1-\cos \phi) \\
a c(1-\cos \phi) \\
b c(1-\cos \phi) \\
& c^{2}+\left(a^{2}+b^{2}\right) \cos \phi
\end{array}\right|
\]
is independent of
(a) \( a \)
(b) \( b \)
(c) \( c \)
(d) \( \phi \).
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