Where's the Gudermannian? From wikipediophile: "The Gudermannian function, named...

		mjcohen on Sept 14, 2013 \| parent \| context \| favorite \| on: Trig Functions Your Math Teachers Never Taught You Where's the Gudermannian? From wikipediophile: "The Gudermannian function, named after Christoph Gudermann (1798–1852), relates the circular functions and hyperbolic functions without using complex numbers."