If \( I=\int \frac{\log \left(x+\sqrt{\left.x^{2}+a^{2}\right)}\right.}{\sqrt{x^{2}+a^{2}}} d x ...
If \( I=\int \frac{\log \left(x+\sqrt{\left.x^{2}+a^{2}\right)}\right.}{\sqrt{x^{2}+a^{2}}} d x \)
(a) \( (1 / 2) \log \left(x+\sqrt{x^{2}+a^{2}}\right)+C \)
(b) \( (1 / 2) \log \left(x+\sqrt{x^{2}+a^{2}}\right)-x+C \)
(c) \( (1 / 2) \log \left(x+\sqrt{x^{2}+a^{2}}\right)+x+C \)
(d) \( (1 / 2)\left[\log \left(x+\sqrt{x^{2}+a^{2}}\right)\right]^{2}+C \)
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