✨ 最佳解答 ✨ qn 11個月以前 a = cos1 ≈ cos57.3° b = sin2 ≈ sin114.6° = sin65.4° a < cos45° = sin45° < b c = tan4 ≈ tan229.2° = tan49.2° > tan45° = 1 a < b < c 留言
