addition formula

addition formula

[ə′dish·ən ‚fȯr·myə·lə]
(mathematics)
An equation expressing a function of the sum of two quantities in terms of functions of the quantities themselves.
References in periodicals archive ?
After each list is compiled, a new generation or an adjoining culture finds a better way of constructing the tables, sometimes rediscovering old ways, yet all mimicking the reasoning and style of Ptolemy's Almagest and its recursive construction by way of versions of the half angle formulas and the addition formulas, whose modern day representatives are
integral representations and addition formulas, have been discovered.