MathieuCharacteristicA
 Usage
• MathieuCharacteristicA[r, q] 给出特征指数为 r ，参数为 q的偶Mathieu函数的特征值  .
Notes
• 特征值  给出  具有形式为  的解时参数  的值，这里  是周期为  的  的偶函数.
 Further Examples
For small q, the characteristic is approximately  .
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The other characteristic is slightly different.
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For large q, the characteristic values are nearly the same for integer \[Nu] differing by 1.
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