tan-1 \(\left(\frac{\sqrt{1+x^2}+\sqrt{1-x^2}}{\sqrt{1+x^2}-\sqrt{1-x^2}}\right),|x|<\frac{1}{2}, x \neq 0\) విలువ
1
\(\frac{\pi}{4}+\frac{1}{2} \cos ^{-1} x^2\)
2
\(\frac{\pi}{4}+\cos ^{-1} x^2\)
3
\(\frac{\pi}{4}-\frac{1}{2} \cos ^{-1} x^2\)
4
\(\frac{\pi}{4}-\cos ^{-1} x^2\)