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#include <math.h>float coshf(float arg);double cosh(double arg); long double coshl(long double arg);
coshf( ) and coshl( ) were added by C99.
The cosh( ) family of functions returns the hyperbolic cosine of arg.
Related functions are asin( ), acos( ), atan2( ), atan( ), tan( ), sin( ), cos( ), and tanh( ).
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