What specific types of math are essential to physics? I have a Geometry book but I think most of it is useless information, in school we never go through the ENTIRE book only some of it, is that because some of it is useless?
in school we never go through the ENTIRE book only some of it, is that because some of it is useless?
"Extra" does not necessarily mean "useless" or "unimportant"! It simply means that there is not enough time in any course to cover everything that could be important for some purpose. At some point, every student has to learn on his own, material that was not covered in one of his courses, and this is where the "extra" material in textbooks becomes useful.
Look at Mary Boas's text "Mathematical Methods in the Physical Sciences", which https://www.physicsforums.com/showthread.php?t=230281" in this forum. I'd say at least 3/4 of the mathematics covered in that text are what one WILL need as a physics major.