How do I get the help system to work in sagecell?

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I've discovered that the name of the function or command should be followed not only by "?" but also by the tab key. When I do that, I can get help for some functions, like "sin" or "diff", but not for others, for example "resultant" or "galois_group". I've also tried "resultant()" and "galois_group()", but they don't work either. What's the secret? Is it because they are methods and not stand-alone functions?