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.
Rock On by David Essex. This was written for the movie That'll Be The Day, starring Ringo Starr... and David Essex. Ringo was a musician who sometimes acted. Essex was an actor who was sometimes a musician. It didn't make it on to the movie. The lyrics are a tribute to the early days of Rock 'n' Roll. This was a US #1 hit for Michael Damian in 1989. Like David Essex, Damian was also an actor. He was on the soap opera The Young And The Restless.