Question
Evalute : $\int \frac{1}{\sqrt{3 x^2-5}} d x$

Answer

$
\begin{aligned}
& \int \frac{1}{\sqrt{3 x^2-5}} d x=\int \frac{1}{\sqrt{(\sqrt{3} x)^2-(\sqrt{5})^2}} d x \\
= & \frac{\log \left|\sqrt{3} x+\sqrt{(\sqrt{3} x)^2-(\sqrt{5})^2}\right|}{\sqrt{3}}+c \\
= & \frac{1}{\sqrt{3}} \log \left|\sqrt{3} x+\sqrt{3 x^2-5}\right|+c .
\end{aligned}
$

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