If \( \int \frac{dx}{\sqrt{e^{-2x} - 1}} \) is equal to :
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Whenever an integral contains terms like \( e^{-x} \) or \( e^{-2x} \) inside a radical or denominator, multiplying the numerator and denominator by a suitable power of \( e^x \) often clears the negative exponents and reveals a straightforward substitution.