jcd jcn jcs jdc jdn jds jelli jnc jnd jns jsc jsd jsn jtheta1 jtheta1t jtheta2 jtheta2t jtheta3 jtheta3m1 jtheta3m1t jtheta3t jtheta4 jtheta4m1 jtheta4m1t jtheta4t

jcs() double jcs ( double  u, double  k  ) Jacobi elliptic functions cs(u, k) Purpose jcs computes the Jacobi elliptic functions cs(u, k). The function is defined as follows: cs(u, k) = cn(u, k) / sn(u, k) Returns cs(u, k). Parameters [in] u Argument u. [in] k Argument k. Error handling Range error (ERANGE) may occur. Reference boost/math/special_functions