Learning Statistics. I never would have picked it, but was forced into it thanks to my economics minor, and I've used it more than most of my CS courses.
I've never met anyone who regretted learning more math. It's the safest investment there is.
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I found probability and statistics to be a very valuable thing to learn as well. I wouldn't have done it on my own because it just seemed so boring compared to the other maths(calc, linear algebra, etc...) but it really has a lot of use in those disciplines that you now have the context to understand. Thankfully my college had it as a requirement for cs.