sin , cos の値を計算で求めるアルゴリズム var sin_cnt = 0, cos_cnt = 0; function sin (x) { let s = x, y = -x*x, b = 1, i = 1, r = x, m; do { sin_cnt++; m = r; r += (s*=y) / (b *= ++i*++i); } while (m - r); return r; } function cos (x) { let…