Method cosh

src/org/opensourcephysics/numerics/Complex.java:670–686

()

  }

  public Complex cosh() {
    double scalar;
    double temp1Re, temp1Im;
    double temp2Re, temp2Im;
    //  cosh(z)  =  ( exp(z) + exp(-z) ) / 2
    // first exp
    scalar = Math.exp(re);
    temp1Re = scalar*Math.cos(im);
    temp1Im = scalar*Math.sin(im);
    // second exp
    scalar = Math.exp(-re);
    temp2Re = scalar*Math.cos(-im);
    temp2Im = scalar*Math.sin(-im);
    temp1Re += temp2Re;
    temp1Im += temp2Im;
    return new Complex(0.5*temp1Re, 0.5*temp1Im);
  }

  public Complex tanh() {
    double scalar;