I need help with the following indefinite integral:

$\int \sqrt{x^2-a^2} \,e^{b x} dx $

where $a$ and $b$ are positive constants. Thanks!

  • $\begingroup$ from where Comes that integral? i don't think that we can get a solution in elementary functions $\endgroup$ – Dr. Sonnhard Graubner Jan 22 '17 at 15:51
  • $\begingroup$ Sonnhard, It showed up in a calculation. I tried several substitutions did not work. $\endgroup$ – user91411 Jan 22 '17 at 15:56
  • 2
    $\begingroup$ i send it to Wolfram Alpha $\endgroup$ – Dr. Sonnhard Graubner Jan 22 '17 at 16:02

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