cot x can be rewritten as cos x / sin x so, sin x + cos x. cosx / sin x sin x + (cos x)^2 / sin x Then if you multiply by sin x... sin x. sin x + sinx. (cos x)^2 / sin x which becomes (sin x)^2 + (cos x)^2 I'll leave the honors to you.
Old Man River. NOTE Old Man River was a standard part of Robeson's repertoire and appears on many of his albums. It also became William Warfield's signature song. Show Boat's 1927 premiere announced the advent of a new kind of musical. For the first time, characters developed and matured.
But by the time Show Boat premiered in December 1927, Robeson was committed to other projects and unable to participate. He did go on to star in the 1928 London production of the musical, and in June of that year, he released his recording of Ol' Man River.. Sung in Robeson's rich, distinctive baritone, it has become for many the definitive version of the song.