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#include <math.h>float acoshf(float arg);double acosh(double arg); long double acoshl(long double arg);
acosh( ), acoshf( ), and acoshl( ) were added by C99.
The acosh( ) family of functions returns the arc hyperbolic cosine of arg. The argument must be zero or greater; otherwise, a domain error will occur.
Related functions are asinh( ), atanh( ), sinh( ), cosh( ), and tanh( ).
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