- Here we note that, using hyperbolic trig. functions, it is also cosh/sinh or 1/tanh.
- The sinh, cosh, and tanh subroutines compute the hyperbolic trigonometric functions of their parameters.
- If its argument is an array, the sinh function will be applied to each element and the result returned as an array.
Late 19th century: from sin(e) + h(yperbolic).
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