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