public static Expression Tanh(Expression x)
{
var z = new Expression("tanh", () => Math.Tanh(x.Val()), (vari) => Math.Pow(Math2.Sech(x.Val()), 2) * x.Diff(vari));
z.AddChildren(x);
return(z);
}
public static Expression Coth(Expression x)
{
var z = new Expression("coth", () => Math2.Coth(x.Val()), (vari) => - Math.Pow(Math2.Cosech(x.Val()), 2) * x.Diff(vari));
z.AddChildren(x);
return(z);
}