noun
trigonometric addition formulas
Mathematical term referring to formulas that express trigonometric functions of sums or differences of angles, such as sin(α±β) and cos(α±β).
加法定理を使って、sin75°の値を求めなさい。
Find the value of sin75° using the addition formulas.
Compound of 加法 (kahō, 'addition') and 定理 (teiri, 'theorem').