EllipticTheta
 Usage
• EllipticTheta[a, u, q]用来给出塞塔函数  (  ).
Notes
 Further Examples
The third argument of EllipticTheta should be a complex number with absolute value less than 1. This argument is the nome corresponding to the modulus employed by most other elliptic functions. See EllipticNomeQ.
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The Jacobi elliptic functions (sn and friends) are often expressed in terms of theta functions, which can be computed very efficiently.
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This is the derivative.
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