Complex contour integration

[kindred radish]

Hi, is there a way to calculate complex integrals in a straight forward way online? I have some exercises that I solved without solutions and would like to check the results… I’ve searched online and the conclusion is wolfram. I have Mathematica on my laptop and wanted to try this https://reference.wolfram.com/language/ref/ContourIntegrate.html but without success. I really don’t know anything about Mathematica (that’s why I’d like a straightforward way). Maybe it’s a license issue? That not all functions are available depending on the subscription? The integral should of course equal 2pi*I but instead I just get the command again as output..

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