PolynomialQ
 Usage
• PolynomialQ[expr, var] 当 多项式在var中，产生True ，否则产生False.
• PolynomialQ[expr,   , ...  ] 检验是否 expr 在  中.
Notes
•  不必是符号; PolynomialQ[f[a] + f[a]^2, f[a]]  .
 Further Examples
Is the expression a polynomial?
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Is the expression a polynomial in the variable that is in the second argument?
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This expression is not a polynomial over the integers, but it is over the integers modulo  .
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