#include<stdio.h>
#include<math.h>
#define PI 3.14159265359
int main()
{
float st,a
scanf("%f",&st)
a = st * PI/180
printf("sin(st)=%f\n", sin(a))
printf("cos(st)=%f\n", cos(a))
return 0
}
求sin的:参考下 #include<stdio.h> void main() { double x,a,b,sum=0printf("请输入x的弧度值:\n")scanf("%lf",&x)int i,j,count=0for(i=1i+=2) { count++a=b=1for(j=1j<=ij++) { a*=xb*=(double)j} if(a/b<0.0000001) breakelse { if(count%2==0) sum-=a/belse sum+=a/b} } printf("%lf\n",sum)}#include<stdio.h>#include <math.h>
void main()
{
double a,b,c,d
scanf("%f,%f",&b,&d)
a=sin(b)/*这是三角函数*/
c=asin(d)/*这是反三角函数*/
printf("sin(b)=%f,asin(d)=%d",a,c)
}
其他三角函数如cos(x)什么的,可以直接用,前提有math.h的头文件