if (TheLfloat(x)->len >= infty) {
var cl_LF xx = extend(x,TheLfloat(x)->len+1);
var cl_LF_cosh_sinh_t hyp = cl_coshsinh_ratseries(xx);
if (TheLfloat(x)->len >= infty) {
var cl_LF xx = extend(x,TheLfloat(x)->len+1);
var cl_LF_cosh_sinh_t hyp = cl_coshsinh_ratseries(xx);