MathML root test cases

\sqrt{a}

\sqrt{a b c}

\sqrt[2]{a}

\sqrt[3]{a}

\sqrt[3 + 4]{a}

\sqrt[\frac{3}{4}]{a}

\sqrt[\sqrt{b}]{a}

\sqrt{\frac{a}{b}}

\sqrt[3]{\frac{a}{b}}

\sqrt[c + d]{\frac{a}{b}}

\sqrt[b]{a}

End of test