"This is a tricky domain because, unlike simple arithmetic, to solve a calculus problem - and in particular to perform integration - you have to be smart about which integration technique should be used: integration by partial fractions, integration by parts, and so on"

Marvin Minsky's quote is describing the trouble of calculus problems. Unlike easy arithmetic, calculus needs a much deeper understanding of the problem and the techniques utilized to solve it. Integration is a key part of calculus and requires using specific techniques such as combination by partial portions and combination by parts. These methods need a certain level of intelligence and understanding of the issue in order to be utilized effectively. Minsky is emphasizing the difficulty of calculus and the need for intelligence and understanding in order to fix the problems. He is also highlighting the significance of understanding which combination technique need to be utilized in order to fix the problem. This quote is a reminder of the intricacy of calculus and the need for intelligence and understanding in order to solve the problems.