If \( A, B, C \) the angles of an acute angled \( \triangle A B C \...

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If \( A, B, C \) the angles of an acute angled \( \triangle A B C \) and
\[
D=\left|\begin{array}{ccc}
(\tan B+\tan C)^{2} & \tan ^{2} A & \tan ^{2} A \\
\tan ^{2} B & (\tan A+\tan C)^{2} & \tan ^{2} A \\
\tan ^{2} C & \tan ^{2} C & (\tan +\tan B)^{2}
\end{array}\right|,
\]
\( \mathrm{P} \)
W
then the least integral values of \( \frac{D}{1000} \) is
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