綾 12個月以前 sin30° = 1/2 tan60° = 3^0.5 sin45° = 1/(2^0.5) 所求 = [(1/2) + (3^0.5)]/[1/(2^0.5)] = [(1 + 2*3^0.5)/2]*(2^0.5) = (2^0.5 + 2*6^0.5)/2 留言