If \( a b c \neq 0 \), then \[\Delta(x)=\left|\begin{array}{ccc}a^{2}(1+x) & a b & a c \\...
If \( a b c \neq 0 \), then
\[\Delta(x)=\left|\begin{array}{ccc}a^{2}(1+x) & a b & a c \\...
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