Changes

==Description==

==Description==

*This function gives the hyperbolic cotangent of 'z',also it is called as circular function.

*This function gives the hyperbolic Cotangent of 'z'.

*It's also called as Circular function.

*COTH is the reciprocal of TANH function.  

*COTH is the reciprocal of TANH function.  

*COTH z=cosh z/sinh z.i.e. e^z+e^-z/e^z-e^-z or Icot iz.where 'I' is the imginary unit and i=sqrt(-1).

*<math>COTH(z)=\frac{Cosh(z)}{Sinh(z)}</math> i.e.<math>\frac( e^z+e^{-z}} {e^z-e^{-z}}</math> or Icot(iz).where 'I' is the imginary unit and i=sqrt(-1).

*Also relation between hyperbolic &trignometric function is  

*Also relation between hyperbolic &trignometric function is  

*cot(iz)=-icothz&coth(iz)=-icot z

*cot(iz)=-icothz&coth(iz)=-icot z