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Function: theta Section: transcendental C-Name: theta Prototype: GGp Help: theta(q,z): Jacobi sine theta-function. Doc: Jacobi sine theta-function $$ \theta_1(z, q) = 2q^{1/4} \sum_{n\geq 0} (-1)^n q^{n(n+1)} \sin((2n+1)z).$$