Hyperbolic tangent function

To use this function, choose Calc > Calculator.

Calculates the hyperbolic tangent of an angle. Hyperbolic trigonometric functions are based on the hyperbola with the equation x² – y² = 1. These functions differ from those in standard trigonometry (also called circular trigonometry), whose functions are based on the unit circle with the equation x² + y² = 1. However, they share many similar identities, such as sinh² x + cosh² x = 1, where h represents hyperbolic.

Syntax

TANH(number)

For number, specify the radians or the column of radians.

Example

Column	Calculator expression	Result
C1 contains 3.7	TANH(C1)	0.998778241281

Uses

Hyperbolic functions have many useful applications in engineering, such as electrical transportation (to calculate length, weight, and stress of cables and conducting wires), superstructure (to compute elastic curves and deflection of suspension bridges), and aerospace (to determine ideal surface coatings for aircraft). In statistics, the inverse hyperbolic sine is used in the Johnson transformation to transform the data so it follows a normal distribution. Normality is a necessary assumption for some capability analyses.

Formula

For a specified value of x, tanh x = sinh x / cosh x, where h represents hyperbolic.

The inverse of the function is arctanh x (tanh⁻¹ x).