A note on the relationship between differentiability of f(x) and differentiability of |f(x)|
Meng Hua · Journal of Nanyang Normal University · 2009
Let x0 be an endpoint of domain of f(x).In this paper,we discuss the relationship between differentiability of f(x) at x0 and differentiability of |f(x)| at x0.It can enhance link between the knowledge learned and new knowledge in teaching.