To simplify the expression \( x^{1/6} \times x^{1/6} \), we can use the properties of exponents. According to the property that states \( a^m \times a^n = a^{m+n} \), we can add the exponents together.
So,
\[ x^{1/6} \times x^{1/6} = x^{(1/6) + (1/6)} = x^{2/6} = x^{1/3} \]
Now, \( x^{1/3} \) can also be expressed in radical form as \( \sqrt[3]{x} \).
Among the given options, the correct equivalent expression for \( x^{1/6} \times x^{1/6} \) is:
\( \sqrt[3]{x} \)
Thus, the equivalent expression is:
\( x^{-\sqrt[3]{x}} \) which seems like a typo or confusion in your options, ensuring we really meant to clarify it should just be noted as \( \sqrt[3]{x} \).