dtrig.c

#include "mathutils.h"

/*****************************************************
* Simple functions using either the Taylor Series 
* or the fast function to first compute e^y and e^(-y)
* then find the hyperbolic sine, cosine,
* and tangent of y
*****************************************************/

double dsinh(double y, int fast){
	if(fast)
		return ((fast_dpowe(y) - fast_dpowe(-y))/2.0);
	return ((taylor_dpowe(y)-taylor_dpowe(-y))/2.0);
}

double dcosh(double y, int fast){
	if(fast)
		return ((fast_dpowe(y) + fast_dpowe(-y))/2.0);
	return ((taylor_dpowe(y)+taylor_dpowe(-y))/2.0);
}

double dtanh(double y, int fast){
	return(dsinh(y,fast)/dcosh(y,fast));
}