How to solve $\int \frac{1}{\sqrt{\frac{C}{x^2}-1}}\;dx\;\;$

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How does one solve the following integral:

$$\int \frac{1}{\sqrt{\frac{C}{x^2}-1}}\;dx\;\;,$$

where $C$ is some constant. Should substitution be used here?

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$$ \int \frac{1}{\sqrt{\frac{C}{x^2}-1}}dx = \int \frac{1}{\sqrt{C-x^2}}\frac{1}{\frac{1}{x}}dx=\\ \int \frac{xdx}{\sqrt{C-x^2}} $$ us the sub $C-x^2 = u$