\title{abs}
\language{en}
\range{-5..5}
\author{Gang XIAO}
\email{xiao@unice.fr}
\computeanswer{no}
\format{html}
\precision{10000}

\text{bad=Continuous but not differentiable,
 Differentiable but not continuous,
 Differentiable of order 1 but not 2,
 Differentiable of order 2 but not 3,
 Differentiable of order 3 but not 4,
 Differentiable of any order}

\text{flist=|x|,
  |x<sup>2</sup>|,
  |x<sup>3</sup>|,
  |x<sup>2</sup>+1|,
  |x<sup>2</sup>-1|,

  |x<sup>3</sup>+1|,
  |x<sup>3</sup>-1|,
  x|x|,
  x<sup>2</sup>|x|,
  x|x<sup>2</sup>|
}

\text{glist=Continuous but not differentiable,
 Differentiable of any order,
 Differentiable of order 2 but not 3,
 Differentiable of any order,
 Continuous but not differentiable,
 
 Continuous but not differentiable,
 Continuous but not differentiable,
 Differentiable of order 1 but not 2,
 Differentiable of order 2 but not 3,
 Differentiable of any order,
}

\integer{itm=random(1..items(\flist))}
\text{f=item(\itm,\flist)}
\text{good=item(\itm,\glist)}

\statement{What is the differentiability of the function
f(x)&nbsp;=&nbsp;\f over the interval [-10,10]?}



\choice{f(x) is}{\good}{\bad}

