How do I check if this expression is real?

Asked Jan 24 '19 at 10:47

Active Jan 24 '19 at 10:47

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How can I check if the result of:

Integrate[Cos[Sqrt[GM/r^3]], r]

is real for real GM and r?

asked Jan 24 '19 at 10:47

mattiav27

Possible duplicate of Why no RationalQ or RealQ? – Henrik Schumacher Jan 24 '19 at 10:57
Well, it is straight-foward to disprove it: bla = Integrate[Cos[Sqrt[GM/r^3]], r]; Table[Im[bla], {GM, -1, 1, .1}, {r, -1, 1, 0.1}] – Henrik Schumacher Jan 24 '19 at 11:00

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