#### 96.2.3 Convert to Hyperbolic Functions

Function: c2hyp (x)

  The function c2hyp (convert to hyperbolic) convert expression with exp function to expression with hyperbolic functions sinh, cosh.

  Examples:

      (%i6) c2hyp(exp(x));
      (%o6)                         sinh(x) + cosh(x)
      (%i7) c2hyp(exp(x)+exp(x^2)+1);
                             2          2
      (%o7)            sinh(x ) + cosh(x ) + sinh(x) + cosh(x) + 1
      (%i8) c2hyp(exp(x)/(2*exp(y)-3*exp(z)));
                                    sinh(x) + cosh(x)
      (%o8)           ---------------------------------------------
                      2 (sinh(y) + cosh(y)) - 3 (sinh(z) + cosh(z))