No, the given function is not polynomial.
What is Polynomial?
Polynomials are sums of terms of the form k⋅xⁿ, where k is any number and n is a positive integer.
As per the definition of polynomial,
A polynomial is a combination of terms separated by + or − signs.
and, a polynomial which has negative and fractional exponents powers are not considered as polynomial.
Hence, there is power 1/3 which is not acceptable in polynomial.
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