void acb_poly_sin_cos_series_tangent(acb_poly_t s, acb_poly_t c, const acb_poly_t h, slong n, slong prec, int times_pi) { slong hlen = h->length; if (n == 0) { acb_poly_zero(s); acb_poly_zero(c); return; } if (hlen == 0) { acb_poly_zero(s); acb_poly_one(c); return; } acb_poly_fit_length(s, n); acb_poly_fit_length(c, n); _acb_poly_sin_cos_series_tangent(s->coeffs, c->coeffs, h->coeffs, hlen, n, prec, times_pi); _acb_poly_set_length(s, n); _acb_poly_normalise(s); _acb_poly_set_length(c, n); _acb_poly_normalise(c); }
void _acb_poly_sin_cos_pi_series(acb_ptr s, acb_ptr c, const acb_srcptr h, slong hlen, slong n, slong prec) { hlen = FLINT_MIN(hlen, n); if (hlen == 1) { acb_sin_cos_pi(s, c, h, prec); _acb_vec_zero(s + 1, n - 1); _acb_vec_zero(c + 1, n - 1); } else if (n == 2) { acb_t t; acb_init(t); acb_const_pi(t, prec); acb_mul(t, t, h + 1, prec); acb_sin_cos_pi(s, c, h, prec); acb_mul(s + 1, c, t, prec); acb_neg(t, t); acb_mul(c + 1, s, t, prec); acb_clear(t); } else if (hlen < TANGENT_CUTOFF) _acb_poly_sin_cos_series_basecase(s, c, h, hlen, n, prec, 1); else _acb_poly_sin_cos_series_tangent(s, c, h, hlen, n, prec, 1); }