Let ƒ(x) = Show that ƒ(x) is not derivable at x=0.

Show that ƒ(x) = [x] is neither continuous nor derivable at x=2.

Show that function

ƒ(x) = is continuous but not differentiable at x=1

If ƒ(x) = |x| show that ƒ’(2)=1

Find the values of a and b so that the function

ƒ(x) = is differentiable at each x є R