Domain Of A Hyperbolic Function
The hyperbolic functions take a real argument called a hyperbolic angle the size of a hyperbolic angle is twice the area of its hyperbolic sector the hyperbolic functions may be defined in terms of the legs of a right triangle covering this sector.
Domain of a hyperbolic function. F x a cosh x a like in this example from the page arc length. One of the interesting uses of hyperbolic functions is the curve made by suspended cables or chains. This website uses cookies to improve your experience while you navigate through the website. The hyperbolic sine function sinh x is one to one and therefore has a well defined inverse sinh 1 x shown in blue in the figure in order to invert the hyperbolic cosine function however we need as with square root to restrict its domain.
This is a bit surprising given our initial definitions. To demonstrate geometric representation of hyperbolic functions we ll draw a hyperbola in cartesian coordinate system. The hyperbolic cosine function written cosh x is defined for all real values of x by the relation cosh x 1 2 ex e x similarly the hyperbolic sine function sinh x is defined by sinh x 1 2 ex e x the names of these two hyperbolic functions suggest that they have similar properties to the trigonometric functions and some of. Hyperbolic function are analogs of trigonometric function and they occur in the solution of many differential or cubic equations.
Definition 4 11 1 the hyperbolic cosine is the function cosh x e x e x over2 and the hyperbolic sine is the function sinh x e x e. 5 c mathcentre january 9 2006. The graph of sinhx is always between the graphs of ex 2 and e x 2. A hanging cable forms a curve called a catenary defined using the cosh function.
Hyperbolic tangent tanh. From sinh and cosh we can create. The hyperbolic function f x sinhx is defined by the formula sinhx ex e x 2. In contrast to trigonometric functions who form a circle hyperbolic functions relate to a hyperbola.
The hyperbolic functions appear with some frequency in applications and are quite similar in many respects to the trigonometric functions.