If two straight lines meet in a graph (to make a point, like a V-shape), is the derivative 0 or undefined at that meeting point? All the examples I have talk about curves, not straight lines...
I'm trying to find the derivative at a specific point on a graph. That point happens to be where two straight lines meet, at x=2.
So does f'(2)=0 or undefined?
I know if it was a curve at x=2 the derivative would be 0 since the tangent is horizontal. But I'm not sure what the derivative would be since the lines create a point at x=2. Is that a clearer explanation?