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FailingBetter
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Solved!

HP Prime: Inverse Laplace of trig returns complex equation

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HP Prime

Hi!

On my HP Prime, when I try to solve an inverse Laplace of the transform of a trig function, it returns a complex equation (Euler's Identity?), rather than the trig function.  Another thread suggested purge(x), but that didn't work for me.  This seems to only affect trig transforms, since non-trig inverse Laplace solutions are correct.  Any help would be appreciated!

 

In case the screenshot doesn't work:

ilaplace(s/(s^2 + 4),s)  –> 1/2 * e^(-2 * i * s) + 1/2 * e^(2 * i * s)

rather than the expected:  cos(2s)

 

Screen Shot 2021-03-07 at 11.45.46 AM.jpg

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FailingBetter
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Solved: in CAS settings, I had "Use i " checked.

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