noun
: a formula or rule that expresses algebraically a function of the sum of two arguments in terms of the same or related functions of the separate arguments [as sin ( x + y ) = sin x cos y + sin y cos x ]
noun
: a formula or rule that expresses algebraically a function of the sum of two arguments in terms of the same or related functions of the separate arguments [as sin ( x + y ) = sin x cos y + sin y cos x ]
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012