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.
River Song. Professor River Song (born Melody Pond) was a child of the TARDIS and the wife of the Doctor, specifically his eleventh incarnation. She was human with Time Lord DNA, conceived by her parents, Amy Pond and Rory Williams, aboard the TARDIS as it traveled through the Time Vortex, and then raised and conditioned by the Silence.