How do I break a long equation over lines?

Question

I am trying to add an equation in a new line. The problem is that the equation is too long for the line, and I need to break it manually. Otherwise, it just overlaps to the righ

Answer 1

As far as I know, this is not possible. When working inside a display, you are responsible for line breaks. How to line break, and how to continue on the next line in case of brackets, is a tough question for humans (check, for instance, the relevant section in Grätzer, "Math into LaTeX"), let alone for a computer.

Example: when you break the first line after \left(, you need a \right. at the end, and \left. at the beginning of the next line (otherwise you'll get an error). Moreover, you'd want the beginning of the next line to be further right than the bracket produced by \left(