The Kumon Level L Solution Book offers several benefits to students, parents, and educators:

: Mastering the techniques of basic differentiation to find rates of change.

Kumon is based on . If you look at a solution book to get past a tricky derivative (e.g., d/dx [ln(sin(x^2))] ), you will fail the next set of worksheets. Calculus builds on itself; copying a limit solution means you won't survive the chain rule section.