関連ワード:  what is the hyperbolic functions    what is hyperbolic functions used for    what is the point of hyperbolic functions    what is the derivative of hyperbolic functions    what is the hyperbolic sine function    what is the hyperbolic cosine function    what is the fundamental identity for hyperbolic functions    what is the derivative of inverse hyperbolic functions    what is the hyperbolic tangent function    what is the hyperbolic discounting function