(1 minus hyperbolic tangent of gent of (x) squared ) multiply by hyperbolic co sinus of e of ine of ( hyperbolic tangent of gent of (x)) equally 0
(one minus hyperbolic tangent of gent of (x) to the power of two) multiply by hyperbolic co sinus of e of ine of ( hyperbolic tangent of gent of (x)) equally zero