what is The COSH function ?

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what is The COSH function ?
« on: 10-17-2016, 05:13:55 »
The COSH trigonometric function returns the hyperbolic cosine of the specified number. The specification for the COSH function is:


FUNCTION COSH (n NUMBER) RETURN NUMBER;

If n is a real number and i = −1 (the imaginary square root of −1), then the relationship between COS and COSH can be expressed as follows:

COS (i * n) = COSH (h)


 

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