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If \( f_{r}(x), g_{r}(x), h_{r}(x), r=1,2,3 \) are polynomials in \( x \) such that \( f_{r}(a)=g_{r}(a)=h_{r}(a), r=1,2,3 \)
\( \mathrm{P} \) and \( F(x)=\left|\begin{array}{lll}f_{1}(x) & f_{2}(x) & f_{3}(x) \\ g_{1}(x) & g_{2}(x) & g_{3}(x) \\ h_{1}(x) & h_{2}(x) & h_{3}(x)\end{array}\right| \),
W) then \( F^{\prime}(x) \) at \( x=a \) is ...... .
\( (1985,2 \mathrm{M}) \)
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