'MathExpressionInput problem XML.'

def get_problem(self):

    xml = dedent('\n                                <problem>\n                                                <script    type="loncapa/python">\n                                derivative    =    "n*x^(n-1)"\n                                                </script>\n\n                                                <formularesponse    type="ci"    samples="x,n@1,2:3,4#10"    answer="$derivative">\n                                                                <label>Let    \\(    x\\)    be    a    variable,    and    let    \\(    n\\)    be    an    arbitrary    constant.    What    is    the    derivative    of    \\(    x^n\\)?</label>\n                                                                <description>Enter    the    equation</description>\n                                                                <responseparam    type="tolerance"    default="0.00001"/>\n                                                                <formulaequationinput    size="40"/>\n                                                </formularesponse>\n                                </problem>')
    return XBlockFixtureDesc('problem', 'MATHEXPRESSIONINPUT    PROBLEM', data=xml)
