What kind of math homework has been trivial to solve with a calculator? I guess you're referring to elementary school arithmetic?
When I was in high school a classmate did their chemistry homework by buying the teachers edition of the textbook, which had the answer key. The whole class knew this trick existed, but most of us slogged through the work manually. I knew another group who divided up the homework problems and then combined. Students have always known how to cheat on homework, but enough students actually do it anyway.
What makes ChatGPT unique here?