SECH function
Hyperbolic secant function. SECH(x) returns the hyperbolic secant of x. The function is defined for all real numbers. The result is in the range (0, 1].
The hyperbolic secant is the reciprocal of the hyperbolic cosine:
$$ \operatorname{sech}(x) = \frac{1}{\operatorname{cosh}(x)} = \frac{2}{e^x + e^{-x}} $$
The argument x can be a real number or a matrix. When it is a matrix, the function returns a matrix with the same dimensions and with the SECH function applied to all elements.
Examples
SECH(0) equals 1
SECH(1) equals 0.6480542
Calculator
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