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