1. If a curve on a graph of f is F9x)=x^2-2x for all real numbers x, is the absolute value (f(x)) diffentiable at x=0? I'm pretty sure its no, but i'm not sure how to explain it.
2. If the same curve exists, is the f(absolute value(x)) differentiable at x=0? Once again, i believe its no, but i can't explain it well.
Thanks a lot