If \( a, b, c \) are positive real numbers
\[
\begin{array}{l}
\th...
If \( a, b, c \) are positive real numbers
\[
\begin{array}{l}
\theta=\tan ^{-1} \sqrt{\frac{a(a+b+c)}{b c}}+\tan ^{-1} \sqrt{\frac{b(a+b+c)}{c a}} \\
+\tan ^{-1} \sqrt{\frac{c(a+b+c)}{a b}}
\end{array}
\]
P
VV
Then, \( \tan \theta \) equals
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