c语言 计算下列分段函数的值

#include<stdio.h>
#include<math.h>
int main() {
    double x,y;
    scanf("%lf",&x);
    if(x<10) y=3*x-2;
    else if(x==10) y=5;
    else if(x>10) y=log(x+3.5)/log(10)/(7.2-cos(2*x)); 
    printf("%lf",y);
    return 0;
}