A \( \frac{2}{1+x^{2}} \)
B \( 2\left(\tan ^{-1} \mathrm{x}\right)^{2} \)
C \( \left(\tan ^{-1} x\right)^{2} \)
D \( \frac{\left(\tan ^{-1} x\right)^{2}}{2} \)
Correct Answer: Option C
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