3831. 1√2sec-1x+1x√2+c
\hspace{-16}\bf{(1)\;\;\int \left(\frac{x^2-1}{x^2+1}\right).\frac{1}{\sqrt{x^4+1}}dx}$\\\\\\ $\bf{(2)\;\;\int \left(\frac{x^2+1}{x^2-1}\right).\frac{1}{\sqrt{x^4+1}}dx}$\\\\\\ $\bf{(3)\;\;\int \frac{\sqrt{x^4+1}}{x^4-1}dx}$\\\\\\
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