((tanh(x)^ two - one)*sinh(tanh(x)) + two *cosh(tanh(x))*tanh(x))*(tanh(x)^ two - one) = zero
(( hyperbolic tangent of gent of (x) squared minus 1) multiply by hyperbolic sinus of e of ( hyperbolic tangent of gent of (x)) plus 2 multiply by hyperbolic co sinus of e of ine of ( hyperbolic tangent of gent of (x)) multiply by hyperbolic tangent of gent of (x)) multiply by ( hyperbolic tangent of gent of (x) squared minus 1) equally 0
(( hyperbolic tangent of gent of (x) to the power of two minus one) multiply by hyperbolic sinus of e of ( hyperbolic tangent of gent of (x)) plus two multiply by hyperbolic co sinus of e of ine of ( hyperbolic tangent of gent of (x)) multiply by hyperbolic tangent of gent of (x)) multiply by ( hyperbolic tangent of gent of (x) to the power of two minus one) equally zero