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LETTERcoshULETTER Hyperbolic cosine function.

Overview
#include <math.h>

r = cosh(x);

double r; // result
double x; // angle

Portability
ANSI

Description
This function calculates the hyperbolic cosine of the specified angle expressed in radians.

Note
Of course all trigonometric functions require the angle be expressed in radians. Pass the angle "w" expressed in degrees to
x = PI/180 * w
to receive its equivalent in radians in "x".

See also
exp