The number of points where
is not differentiable is:
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
The function is non differentiable at points where its graph has sharp turns (or has kinks). Clearly, 5 such points are there from the above graph.