#include<math.h>
double?sin(double);
double?nResult(double,double);
int?main()
{
double?x=0;
scanf("%lf",&x);
printf("sin(%lf)=%lf\n",x,sin(x));
return?0;
}
double?sin(double?x)
{
//sin(x)=x-x^3/3!+x^5/5!-x^7/7!+……+(-1)(n^2n+1)/(2n+1)!+……
int?i=0;
double?result=0,n=0;
while(?fabs(?n=nResult(x,2*++i-1)?)?>?0e-5?)//絕對值大於10^-5次方就循環
result+=(i%2==1)?n:-n;
return?result;
}
double?nResult(double?x,double?n)
{
//(n^2n+1)/(2n+1)!也就是n/1*n/2*n/3*n/4*.....n/(2n+1)
return?n==1?x:nResult(x,n-1)*x/n;
}