习题1-4

#include<stdio.h>
#include<math.h>
int main() {
    const double pi = acos(-1.0);
    int n;
    double val = pi / 180;
    scanf("%d", &n);
    double vsin = sin(n*val);
    double vcos = cos(n*val);
    printf("%.3f %.3f\n",vsin,vcos);
    return 0;
}

正弦和余弦