"F of u?"--Alan
"Grow up, Alan"--Kurt


[(u² + 1) (2) - (2u)(2u)]/(u²+1)²
[-2(10x² + x +1) +2]/[(10x² + x + 1)² + 1]
"So the answer to all that is 0?"--Kurt
"Yes... that's the beauty of calculus"--Lipski