Cot x is 1/tan x or cos x / sin x or +- sqrt cosec^2 x -1.
Original Cast Recording. Arista, 1973. Includes original hit song Day by Day sung by Robin Lamont. Sung by the original cast members David Haskell, Peggy Gordon, Robin Lamont, Gilmer McCormick, Sonia Manzano, Jeffrey Mylett, Stephen Nathan, Herbie Braha, Joanne Jonas, and Lamar Alford.
The Doris Day Show was also the title of her radio show which aired from Hollywood in 1952, with  It's Magic  as the theme song. In addition to showcasing Doris Day, whose successful two-decade movie career was ending, the show is remembered for its format and cast changes over the course of its five-year run.