GPT4 with WolframAlpha plugin even gave me enough information to implement Taylor polynomial approximation for Gaussian function (don't ask why I needed that), which would have otherwise taken me hours of studying if I could even solve it at all.
PS: GPT4 somehow knows even things that are really hard to find online. I recently needed standard error but not of mean but rather of standard deviation. GPT4 not only understood my vague query but gave me formula that is really hard to find online even if you already know the keywords. I know it's hard to find, because I went ahead to double-check ChatGPT's answer via search.