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cosh
Hyperbolic cosine.SYNOPSIS:
double x, y, cosh();
y = cosh(x);
DESCRIPTION:
Returns the hyperbolic cosine of an argument in the range MINLOG to MAXLOG.
cosh(x) = (exp(x) + exp(-x))/2.
ACCURACY:
Relative error:
arithmetic domain # trials peak rms
DEC +- 88 50000 4.0e-17 7.7e-18
IEEE +-MAXLOG 30000 2.6e-16 5.7e-17
ERROR MESSAGES:
message condition value returned
overflow |x| > MAXLOG MAXNUM