#include <math.h>
double cos(double x);
#include<stdio.h>
#include<math.h>
int main(void)
{
double angl,result;
angl = 1;
result = cos(angl);/*求余弦值*/
printf("cos(%lf) is %lf\n",angl,result);/*格式化输出*/
angl = 3.1415926;
result = cos(angl);/*求余弦值*/
printf("cos(%lf) is %lf\n",angl,result);/*格式化输出*/
return 0;
}
cos(1.000000) is 0.540302 cos(3.141593) is -1.000000
#include <math.h>
double cosh(double x);
(exp(x)+exp(x))/2
#include <math.h>
main(){
double answer = cosh(0.5);
printf("cosh(0.5) = %f\n", answer);
}
cosh(0.5) = 1.127626
#include<stdio.h>
#include<math.h>
int main(void)
{
double resut;
double x =1;
resut = cosh(x);/*求双曲余弦值*/
printf("cosh(%lf) = %lf\n",x,resut);/*格式化输出*/
return 0;
}
cosh(1.000000) = 1.543081
#include <math.h>
double acos (double x);
#include <math.h>
main(){
double angle;
angle = acos(0.5);
printf("angle = %f\n", angle);
}
angle = 1.047198
#include<stdio.h>
#include<math.h>
int main(void)
{
double angl,result;
angl = 1;
result =acos(cos(angl));/*求反余弦值*/
printf("acos(%lf) is %lf\n",cos(angl),result);/*格式化输出*/
angl = 3.1415926;
result = acos(cos(angl));/*求反余弦值*/
printf("acos(%lf) is %lf\n",cos(angl),result);/*格式化输出*/
return 0;
}
acos(0.540302) is 1.000000 acos (-1.000000) is 3.141593
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