Wallis formulas

Wallis formulas

[′wäl·əs ‚fȯr·myə·ləz]
(mathematics)
Formulas that determine the values of the definite integrals from 0 to π/2 of the functions sin n (x), cos n (x), and cos m (x) sin n (x) for positive integers m and n. Also known as Wallis theorem.