Hyperbolic tangent

Hyperbolic tangent function: $\tanh (x) = \frac{e^{x} - e^{- x}}{e^{x} + e^{- x}}$

Syntax

tanh(Real)

Given a number $x$ , returns $t a n h (x)$ . Returns a number in the interval $(- 1, 1)$ .

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