\[ \begin{array}{l} 5 \cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right...

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\[
\begin{array}{l}
5 \cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right)+7 \sin ^{-1}\left(\frac{2 x}{1+x^{2}}\right)- \\
4 \tan ^{-1}\left(\frac{2 x}{1-x^{2}}\right)-\tan ^{-1} x=5 \pi
\end{array}
\]
\( \mathrm{P} \)
W
Then \( x \) is equal to
(A) 3
(B) \( -\sqrt{3} \)
(C) \( \sqrt{2} \)
(D) \( \sqrt{3} \)
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